explain why the inside of the flask and burette tip are rinsed awith water during the titration? how will this affect the outcome of the titration?
Answers
The inside of the flask and burette tip are rinsed with water during titration to ensure that all the reagents are completely transferred and react with each other, thus providing accurate results.
During titration, it is crucial to have an accurate measurement of the reagents being used. Rinsing the inside of the flask and burette tip with water helps remove any residual reagent from previous experiments or handling. This ensures that the exact amount of reagent is introduced into the flask, leading to a more precise reaction.
Additionally, rinsing the burette tip with the titrant solution ensures that the initial reading of the burette is accurate. Any water droplets present in the tip can cause a difference in volume, which may lead to inaccurate results.
If the flask and burette tip are not rinsed properly, residual reagents or water droplets may interfere with the reaction, causing an inaccurate measurement of the endpoint. This can lead to errors in determining the concentration of the analyte.
Rinsing the inside of the flask and burette tip with water during titration is a critical step to ensure accurate measurements and reliable results. It helps remove any residual reagents and ensures that the proper amount of reagent is introduced into the flask for a complete reaction. Failure to do so may lead to errors in the outcome of the titration.
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Related Questions
According to this balanced equation, how many grams of water (H₂O) form in this reaction? KOH 56.11 g HCI 36.46 g A. 167.12 grams OB. 94.20 grams C. 54.90 grams OD. 18.02 grams KCI 74.55 g H₂O ? SUBMIT
Answers
KOH + HCl -> KCl + H2O
From the equation, we can see that 1 mole of KOH reacts with 1 mole of HCl to produce 1 mole of water.
To determine the amount of water formed, we first need to calculate the number of moles of HCl and KOH used in the reaction:
moles of HCl = mass / molar mass = 36.46 g / 36.46 g/mol = 1.0 mol
moles of KOH = mass / molar mass = 56.11 g / 56.11 g/mol = 1.0 mol
Since the reaction is 1:1 between KOH and HCl, we know that 1.0 mol of water is formed.
To calculate the mass of water formed, we can use the molar mass of water, which is 18.02 g/mol:
mass of water = moles of water x molar mass of water = 1.0 mol x 18.02 g/mol = 18.02 g
Therefore, the answer is OD. 18.02 grams.
Why does potassium have a higher second ionization energy than calcium?
Answers
Answer:
The first ionization energy for K is less than Ca because Ca has a larger effective nuclear charge. There is a large increase in the second ionization energy for K compared to Ca because removal of the second electron from K is a core electron that is in a quantum shell closer to the nucleus.
Explanation:
what does inductive effect mean?
Answers
Answer:
Tbh I looked it up but here is what I found. I hope it helps
Explanation:
In chemistry, the inductive effect is an effect regarding the transmission of unequal sharing of the bonding electron through a chain of atoms in a molecule, leading to a permanent dipole in a bond.
What is the freezing point, in °C, of a 0.407 m solution of C5H4 in benzene? FP (benzene) = 5.5 °C Kf(benzene) = 5.12 °C/m
Answers
The freezing point, in °C, of a 0.407 m solution in benzene is 3.42°C
How to calculate freezing point?Freezing point refers to the temperature at which a liquid freezes, and the solid and liquid phases are in equilibrium.
According to this question, a 0.407 m solution is in benzene solution. The freezing point of the solution can be calculated as follows:
∆T = K × m
Where;
K = freezing point constant∆T = freezing pointm = molality∆T = 5.12 × 0.407
∆T = 2.084°C
Freezing point in benzene = 5.5°C - 2.084°C = 3.42°C
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Answer:
b, d, -13.4
Explanation:
Glucose is an example of which Carbon-based macromolecule?
proteins
carbohydrates
lipids
nucleic acids
Answers
Answer:
Monosaccharides are the most basic units of carbohydrates. These are simple sugars, including glucose, fructose, and others. They contain between three and seven carbon atoms, have a sweet taste and are used by the body for energy.
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How is heat related to energy?
A)Heat is a form of energy.
B)Heat and energy are not related.
C)Heat is temperature and energy is fuel.
D)Heat can be created, but energy cannot.
Answers
Heat is related to energy as it is referred to a form of energy which is denoted as option A.
What is Energy?This is also known as thermal energy and it is referred to as the ability to do work and there are different types which include the following below:
Mechanical energyElectrical energyHeat energy.It is also referred to as the form of the energy which is transferred from one body or surface to another as a result of the differences in temperature so as to reach an equilibrium.
Heat energy has various functions such as heating water and electricity generation. It is also lost when energy is transferred from one trophic level to another which is the reason why the energy efficiency is not 100 percent which is therefore the reason why option A was chosen.
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What is the chemical reaction of C4H8 + O2---
CO2 + H20
Answers
This reaction is exothermic is the chemical reaction of \(C_4H_8\)+ \(O_2\)--- \(CO_2\)+ \(H_20.\)
Exothermic reactions in chemistry refer to chemical reactions that release energy in the form of heat, light, or sound. During an exothermic reaction, the reactants have a higher energy level than the products, resulting in the release of excess energy in the form of heat, light, or sound. The opposite of an exothermic reaction is an endothermic reaction, in which energy is absorbed from the surroundings.
One common example of an exothermic reaction is combustion, in which a fuel reacts with oxygen to produce heat and light. Another example is the reaction between an acid and a base, which results in the release of heat and the formation of a salt and water. Exothermic reactions play an important role in many biological and chemical processes, including metabolism, respiration, and the production of energy.
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Proteco Oils Pressed Purity are a range of cold pressed oils ideal for cooking. The high quality oils are extracted from nuts, fruit and seeds. They are flavoursome and are naturally chemical and preservative free. Pressed Purity are one of the few oils on mainstream supermarket shelves which is 100% Australian. They offer a wider range variants than any other oil manufacturer in Australia. Proteco Oils’ state of the art refinery in Kingaroy, South East Queensland is uniquely equipped. With highly specialized equipment for complete oil processing on a large scale. Now, exporting into China and throughout Asia Pacific, this family owned company has grown with the help of Evolve Brand Design
Market Mostly females, 25-60+ years, with a contemporary cooking attitude. These consumers are health conscious, seeking natural and chemical free options for themselves and their family. The secondary target audience are men and women of all ages. This group consider themselves to be gourmet home chefs and are open to new tastes. Communication of the product concept was critical with the initial brand name development. Evolve Brand Design presented a range of concepts and the brand name ‘Pressed Purity’ was chosen. This concept was the winner as it implied the chemical free processing of the raw crops into edible oils. Likewise, the design for the brand is an analogy for pressing the oil from the fruit, nut or seeds using a vice. The Pressed Purity distinctive edge is threefold. Chemical free, 100% natural ingredients and genuinely Australian. Export opportunities have risen due to the third, very important, unique selling point (USP). In addition, they have a wide range of flavours with applications tailored to a range of food preparation methods. From flavourful salad dressing oils to baking and high heat applications like stir-frying and barbeques, Pressed Purity has a solution
Q.2.1 With the use of examples applicable to the case study, explain human resource forecasting. (10)
Q.2.2 Explain the concept of product differentiation in the context of Pressed Purity. (5)
Q.2.3 Recommend a work-study method for Proteco Oil’s refinery. (10)
Q.2.4 Identify and explain the criteria Proteco Oil used for market segmentation. (10)
Q.2.5 Identify the operational process used by Proteco Oil. Justify your choice. (10)
Answers
Q.2.1 With the use of examples applicable to the case study, explain human resource forecasting. Human resource forecasting refers to the process of estimating and planning for the future staffing needs of an organization.
Q.2.3 One work-study method that could be recommended for Proteco Oil's refinery is the method of time and motion study.
Q.2.1 It involves analyzing the current workforce, identifying future workforce requirements, and developing strategies to meet those needs. In the case of Proteco Oil's Pressed Purity, human resource forecasting would involve predicting the number and types of employees needed to support the company's growth and expansion.
For example, as Pressed Purity expands its export operations into China and throughout the Asia Pacific region, they would need to forecast the additional human resources required to manage international logistics, distribution, and marketing. This may include hiring employees with expertise in international trade, language skills, and knowledge of the target markets. Human resource forecasting would also consider the need for additional staff at the state-of-the-art refinery in Kingaroy to handle increased production and quality control.
Q.2.2 Product differentiation refers to the process of distinguishing a product from its competitors by highlighting unique features, benefits, or characteristics. In the context of Pressed Purity, product differentiation is evident in several aspects of their offerings.
One example of product differentiation is their focus on being 100% Australian. This sets them apart from other oil manufacturers in Australia who may rely on imported ingredients. By promoting their Australian origin, Pressed Purity appeals to consumers who prioritize supporting local businesses and value the quality associated with Australian products.
Additionally, Pressed Purity emphasizes being chemical and preservative-free. This addresses the growing consumer demand for natural and healthier food options. By positioning their oils as naturally chemical-free, Pressed Purity differentiates themselves from competitors who may not have such a strong emphasis on natural and chemical-free products.
Q.2.3 One work-study method that could be recommended for Proteco Oil's refinery is the method of time and motion study. Time and motion study involves analyzing and improving work processes by observing and measuring the time required to complete specific tasks or activities.
In the context of the refinery, a time and motion study could be conducted to identify any inefficiencies or bottlenecks in the oil processing operations. This could involve observing workers as they perform tasks and measuring the time taken for each step of the process. By analyzing the data collected, the refinery management can identify areas where time can be saved, processes can be streamlined, and productivity can be improved.
For example, the time and motion study may reveal that certain equipment or machinery in the refinery is causing delays or requiring excessive manual labor. Based on these findings, the management can make informed decisions on investing in more efficient equipment or implementing process improvements to optimize productivity and reduce costs.
Q.2.4 Proteco Oil used the following criteria for market segmentation:
Demographic segmentation: The primary target audience for Pressed Purity is mostly females, aged 25-60+ years, with a contemporary cooking attitude. These consumers are health-conscious and seek natural and chemical-free options for themselves and their families. The secondary target audience includes men and women of all ages who consider themselves gourmet home chefs and are open to new tastes.
Psychographic segmentation: Pressed Purity targets consumers who prioritize natural and chemical-free products. By emphasizing the use of 100% natural ingredients and being genuinely Australian, Pressed Purity appeals to health-conscious consumers who value the quality and authenticity of the products they consume. They also cater to gourmet home chefs who are looking for unique and flavorful cooking options.
Geographic segmentation: Initially, Proteco Oil focused on the domestic market in Australia.
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QUICK PLEASE HELP ME 30 POINTS RIGHT ANSERS ONLY :)
what term describe this particle model nh3, oh-, nh4+
Answers
Answer: Its a weak base
Explanation: Clicked on that and got the answer right. :)
The image that has been shown has helped us to know that the particles are weak bases. Option A
What is a weak base?
A chemical species or substance that has a restricted capacity to receive or interact with protons (H+ ions) in a solution is said to be a weak base. Weak bases only partially ionize or interact with water, in contrast to strong bases, which totally breakdown into ions in water and quickly take protons.
Compared to strong bases, weak bases have a lesser affinity for protons and fewer alkaline characteristics. They are frequently identified by the considerably lower concentration of hydroxide ions (OH-) in a solution and their imperfect dissociation equilibrium.
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if you were conducting an experiment to see whether eating candy makes gerbils fat, what variable might you change?
A:The number of gerbils you feed incorrect answer
B:The amount of candy the gerbils eat incorrect answer
C:The amount of water the gerbils drink incorrect answer
D:The body mass of the gerbils incorrect answer
Answers
Answer:
B
Explanation:
the less candy will be the smallest gerbil and the most candy will be the fatest
Answer:
A) The number of gerbils you feed
Explanation:
If you wanted to test whether eating candy made gerbils fat you would need to fluctuate the amount of candy each group receives to observe whether there was any differnce in weight
A study was conducted of 90 adult male patients following a new treatment for congestive heart failure. One of the variables measured on the patients was the increase in exercise capacity (in minutes) over a 4-week treatment period. The previous treatment regime had produced an average increase of μ=2 minutes. The researchers wanted to evaluate whether the new treatment had increased the value of μ in comparison to the previous treatment. The data yielded y(bar)=2.17 and s=1.05.
(a) if the actual value of mu is 2.1 and alpha is reduced from 0.05 to 0.01, what would be the effect on the power curve?
(b) If the sample size is reduced from 90 to 50, what would be the effect on the power curve?
Answers
a. Decreasing alpha from 0.05 to 0.01 makes the significance level more stringent. You will be less likely to reject the null hypothesis, even when it's false. This increases the probability of a Type II error, thus potentially reducing the power of the test. The power curve will shift to the left.
b. If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.
What more should you know about decreasing the alpha and the power curve?The power curve is a graph that shows the probability of rejecting the null hypothesis as a function of the true value of the mean.
In the given scenarios of this study, Reducing the significance level and reducing the sample size will shift the power curve to the left, indicating a decrease in the statistical power of the test.
The power of a statistical test is the probability that it correctly rejects the null hypothesis when the alternative hypothesis is true.
a) Reducing alpha from 0.05 to 0.01 means that we are more stringent in our assessment of whether the new treatment is effective.
This will result in a decrease in the power of the test, meaning that it is less likely that we will be able to detect a difference between the new treatment and the previous treatment.
b) If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.
This is because a smaller sample size decreases the power of the test. A larger sample size provides more information and thus makes it more likely to correctly reject the null hypothesis when the alternative hypothesis is true.
Therefore, by reducing the sample size, you are decreasing the likelihood of detecting a true effect if one exists, thus reducing the power of the test.
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Which term best describes salt water made by combining table salt with pure water
Answers
Answer: "homogenous mixture." out of these 2
brine, salt water, particularly a highly concentrated water solution of common salt (sodium chloride).
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Why is it important that all students tested must be the same age? (Scientific method)
Answers
A petroleum product of viscosity 0.5 Ns/m² and density 700 kg/m³ is pumped from a tank through a pipe of 0.15 m diameter to another storage tank 100 m away. The pressure drop along the pipe is 10.1526 psia. The pipeline has to be repaired and it is necessary to pump the liquid by an alternative route consisting of 70 m of 200 mm pipe followed by 50 m of 100 mm pipe. Calculate the pressure drop for the alternative route. Is a pump capable of developing a pressure of 43.5113 psia, will be suitable for use during the period required for the repairs? Take the roughness (E) of the pipe surface as 0.05 mm.
Answers
The pressure drop for the alternative route consisting of 70 m of 200 mm pipe followed by 50 m of 100 mm pipe is calculated to be X psia. A pump capable of developing a pressure of 43.5113 psia will be suitable for use during period required for the repairs.
To calculate the pressure drop for the alternative route, we can use the Darcy-Weisbach equation, which relates the pressure drop to the pipe characteristics and flow parameters. The equation is given by:
ΔP = (f * (L / D) * (ρ * V^2)) / (2 * g)
First, we calculate the velocity of the flow in each section of the alternative route using the equation:
V = Q / (A * ρ)
Using the given diameter and density, the velocities in the 200 mm pipe and the 100 mm pipe.
Next, Darcy friction factor (f) each pipe section using Colebrook-White equation: 1 / √f = -2 * log10((E / (3.7 * D)) + (2.51 / (Re * √f)))
We can calculate the Reynolds number for each pipe section and then solve the Colebrook-White equation to obtain the friction factors.
Finally, we can calculate pressure drop using the Darcy-Weisbach equation for each pipe section, considering the respective length, diameter, velocity, friction factor, and density.
If a pump capable of developing a pressure of 43.5113 psia is used, we compare this value to the calculated pressure drop for the alternative route.
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Which one of the following is a Bronsted-Lowry acid?
a. (CH3)3NH+
b. CH3COOH
c. HF
d. HNO2
Answers
Out of the given options, b. CH₃COOH is an example of Bronsted-Lowry acid.
According to the Bronsted-Lowry acid-base theory, an acid is a substance that donates a proton (H⁺) to another substance. Among the given options, CH₃COOH (acetic acid) is the only compound that can donate a proton.
a. (CH₃)₃NH⁺ is a conjugate acid, as it can accept a proton but cannot donate one.
c. HF is a weak acid that can donate a proton but is not the correct answer in this case.
d. HNO₂ is a weak acid but is not the correct answer in this case.
CH₃COOH, also known as acetic acid, can release a proton (H⁺) in solution, making it a Bronsted-Lowry acid. It is a common organic acid found in vinegar and other food products.
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Al + Pb(NO3)2 -------------------------------> ? fasttttttttttttttttt
Answers
4Al + 2Pb(No3)2 → 4Al(No3) + Pb2
Hope this helps!
What is the pressure of nitrogen in atmospheres of a sample that is at 516.0 mm hg?
A) 0.679 atm
B) 5.09
C) 18.4 atm
D) 35.1 atm
Answers
Answer:
nitrogen in atmospheres of a sample is 0.679
defination of dative covalent bond
Answers
In coordination chemistry,
A coordinate covalent bond also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the two electrons derive from the same atom. The bonding of metal ions to ligands involves this kind of interaction.
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State one similarity in the electronic structure between sodium and chlorine?
Answers
i hope this helps
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the similarity in the electronic configuration of sodium and chlorine element is that their valence shell lack only one electron in in getting fully filled shell.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The similarity in the electronic configuration of sodium and chlorine element is that their valence shell lack only one electron in in getting fully filled shell.
Therefore, the similarity in the electronic configuration of sodium and chlorine element is that their valence shell lack only one electron in in getting fully filled shell.
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In osmosis, if a membrane separates two solutions, liquid will tend to move from
the side with the stronger solution to the side with the weaker solution. A tea bag
is placed inside a cup of hot water. Which best describes the process of osmosis
in this situation?
1.Osmosis does not occur because the hot water is the only solution.
2.The water, having a stronger concentration, moves inside the tea bag.
3.The water near the tea leaves, having a stronger concentration of tea,
moves outside the tea bag.
4.The tea leaves, having a weaker concentration, release their juices
into the water.
Answers
Answer:
2.The water, having a stronger concentration, moves inside the tea bag.
Explanation:
This is a form of osmosis called hypotonic, in which a solution with higher amounts of fluids than the cell will cause the cell to swell and expand. The opposite happens in hypertonic when the solution has fewer fluids than the cell, causing the cell to shrink. Essentially the liquid moves from the higher concentration to the lower one.
Organism that consist of many cells?
Answers
Answer:
Multicellular Organisms.
Explanation:
Hi
At a particular point in time, a given reaction is found to have a K value larger than 1 and a Q value less than 1. Which of the following statements would be TRUE?
1. The reaction is already at equilibrium.
2. The reaction will proceed to the left.
3. The reaction will proceed to the right.
Answers
The connection between the reactant and product concentrations at equilibrium is expressed by the equilibrium constant or K value. An equilibrium product concentration greater than the reactant concentration is indicated by a K value greater than 1. Option 3 is correct.
The present concentration of the reactants is greater than the concentration of the products when Q is less than 1. In order to reach equilibrium and boost the product concentration, the reaction must go to the right. Because the concentration of the products is already greater than the concentration of the reactants, the reaction is not in equilibrium and cannot move to the leftThe correct option is 3.
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sodium react gently with water ture or false
Answers
false,
sodium has a vigorous reaction with water.
This can be observed by putting a piece of sodium in water,
it moves swiftly across the surface of water and reacts violently.
Which one of the following solutions would be the most basic? A) NaCN B) NaNO₂ C) HONH₂ D) H₂NNH₂
Answers
When it comes to basic solutions, the pH of a solution is a measure of how basic or acidic it is. Basic solutions have a pH greater than 7. A stronger base has a higher pH than a weaker base.
To determine which one of the following solutions would be the most basic, we need to find out which of them produces the most OH- ions when dissolved in water.
We will use the following information: HNO2 + H2O ⇌ H3O+ + NO2−HONH2 + H2O ⇌ H3O+ + ONH3H2NNH2 + H2O ⇌ H3O+ + NNH3+NaCN + H2O → Na+ + OH- + HCN.
As you can see, NaCN does not produce any OH- ions, so it cannot be the most basic. NaNO2 produces only a small number of OH- ions since it is a weak base, so it cannot be the most basic either.
HONH2 and H2NNH2 are both stronger bases than NaNO2, but H2NNH2 is the strongest of the three.
This means that the most basic solution would be D) H2NNH2.
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hey so i dont get this help please
Answers
Answer:
ta da
Explanation:
FILL THE BLANK.The π bond in ethylene, H2C=CH2, results from the overlap of ________. The bond in ethylene, H2C=CH2, results from the overlap of ________.1- sp3 hybrid orbitals2- p atomic orbitals3- sp hybrid orbitals4- s atomic orbitals5- sp2 hybrid orbitals
Answers
The π bond in ethylene, H2C=CH2, results from the overlap of p atomic orbitals. Therefore, the correct answer is option 2.
A pi bond is created when two atomic orbitals overlap side by side. A pi bond is created when there are parallel electron cloud overlap between p orbitals present on carbon atoms that lie in the same plane. The overlapping of p atomic orbitals results in a bond referred to as a pi bond or π bond. Ethene (ethylene) is an organic molecule with the formula C2H4. The two carbon atoms are bonded together via a double bond, with each carbon atom forming a sigma bond with one of the two hydrogens and a π bond with the other carbon atom.
Therefore, the π bond in ethylene results from the overlap of p atomic orbitals. An sp hybrid orbital is produced by the mixing of one s and one p orbital, resulting in two sp hybrid orbitals. An sp2 hybrid orbital is produced by the mixing of one s and two p orbitals, resulting in three sp2 hybrid orbitals. An sp3 hybrid orbital is created by mixing one s and three p orbitals, resulting in four sp3 hybrid orbitals. Finally, s atomic orbitals cannot form a bond.
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Which statements about scientific explanations are true? I. Scientific explanations must prove that a hypothesis is true. II. Scientific explanations should be based on evidence or data. III. Scientific explanations must have logical and consistent arguments. IV. Scientific explanations should use scientific principles, models, and theories. A. I, II, III and IV B. I, II and III only C. II, III and IV only D. II and III only
Answers
Answer:
Statement about scientific explanations is true :
C. II, III and IV only
Which of the following is NOT a function of the skeletal system?
production of blood cells
protect delicate organs
storage of some minerals
elimination of carbon dioxide
Answers
Answer:
production od blood cells
a 0.510 aqueous solution of kbr has a total mass of 77.0 g. what masses of solute and solvent are present?
Answers
If a 0.510 aqueous solution of KBr has a total mass of 77.0 g the masses of solute and solvent present are 39.27 g and 37.73 g respectively.
We know that the concentration of an aqueous solution is given by the mass of the solute divided by the total mass of the solution.
C = m solute / m solution
The total mass of the solution is 77.0 g, and the concentration of the solution is 0.510.
To find the mass of the solute (KBr), we can use the following formula;
the mass of solute = concentration × mass of solution
mass of solute = 0.510 × 77.0g ≈ 39.27g
So, the mass of KBr present in the solution is about 39.27 g.
To find the mass of the solvent (water), we can subtract the mass of the solute from the total mass of the solution.
mass of solvent = total mass of the solution - the mass of solute
mass of solvent = 77.0 g - 39.27 g ≈ 37.73 g
Therefore, the mass of solute (KBr) present is about 39.27 g, and the mass of solvent (water) present is about 37.73 g.
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A rectangular block has the following dimensions: 3.21 dm, 5.83 cm, and 1.84 in. The block has a mass of 1.94 kg. What is the density of the blocking/mL? 1 in = 2.54 cm
Answers
The density of the rectangular block in g/mL is 7.0.
Given the following data:
Mass of block = 22.8 gra1.94 kg Length of block = 3.21 cmWidth of block = 5.83 cmHeight of block = 1.84 in.To find the density of the block in g/mL:
First of all, we would determine the volume of the rectangular block by using the following formula:
\(Volume = length\) × \(width\) × \(height\)
Conversion:
1 in = 2.54 cm
5.83 in = X cm
Cross-multiplying, we have:
\(X = 2.54(5.83)\\\\X = 14.81 \; cm\)
\(Volume = 3.21\) × \(5.83\) × \(14.81\)
Volume = 277.16 cubic centimeters.
Note: Milliliter (mL) is the same as cubic centimeters.
1000 grams = 1 kg
Y grams = 1.94 kg
Cross-multiplying, we have:
Y = 1940 grams
Now, we can find the density:
\(Density = \frac{Mass}{Volume}\\\\Density = \frac{1940}{277.16}\)
Density = 7.0 g/mL
Therefore, the density of the rectangular block in g/mL is 7.0.
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