If the methane has a volume of 0.65 L when under 10 atm. of pressure and at a temperature of 305 K, find the mass of oxygen that is needed to use up all of the methane.

Considering the Dalton's partial pressure, the total pressure in the flask is 5.4 atm.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

Dalton establishes that, at a stable temperature, the total pressure of a mixture of gases that do not chemically react with each other is equal to the sum of the partial pressures that each of its components would exert:

\(P_{T}\)=P₁ + P₂ + ... + Pₙ

where n is the amount of gases present in the mixture.

This relationship is due to the assumption that there are no attractive forces between the gases.

In this case , you know:

The total pressure in the flask is calculated as:

\(P_{T}\)=\(P_{H_{2} }\) + \(P_{O_{2} }\)

Substituting the corresponding values:

\(P_{T}\)=3.6 atm + 1.8 atm

Solving:

\(P_{T}\)=5.4 atm

Finally, the total pressure is 5.4 atm.

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Even when using blank correction in external calibration, matrix effects can cause the same analyte concentration in the unknown and a standard to give different responses. Matrix effects refer to the interference caused by the sample matrix on the analyte measurement.

1. External calibration involves preparing a series of standard solutions with known analyte concentrations.
2. The unknown sample is then analyzed using the same instrument and method as the standards.
3. To correct for any background signals or interferences, a blank solution (free of analyte) is also measured and subtracted from the standard and unknown readings.
4. However, despite this blank correction, matrix effects can still occur.
5. Matrix effects can arise from the sample's composition, such as its chemical nature, pH, or presence of other compounds.
6. These matrix effects can cause the analyte to interact differently with the sample matrix compared to the standards, leading to different responses even at the same analyte concentration.
7. These differences in responses can be due to various factors, such as signal suppression or enhancement caused by the matrix.
8. Therefore, it is important to be aware of and account for matrix effects when performing external calibration.
9. Techniques such as matrix-matched calibration or standard addition can be used to minimize the impact of matrix effects on the accuracy of the analyte measurement.
10. Overall, even with blank correction, matrix effects can still cause different responses for the same analyte concentration in the unknown and the standard in external calibration.

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The number of grams of Na₂CO₃ required to neutralize 30 ml of 0.05 N HCl is 1.05 g.

The equation for the neutralization reaction between Na₂CO₃ and HCl is given as follows;

Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂

The molarity of HCl is given as 0.05 N and the volume of HCl used is 30 ml, which is equal to 0.03 L. Therefore, the number of moles of HCl used is given as follows;

The number of moles of HCl = Molarity × Volume = 0.05 N × 0.03 L = 0.0015 mol

Using the equation above, it can be seen that one mole of Na₂CO₃ reacts with two moles of HCl. Therefore, the number of moles of Na₂CO₃ required is;

A number of moles of Na₂CO₃ = 0.0015 mol ÷ 2 = 0.00075 mol

The molar mass of Na₂CO₃ is given as 106 g/mol.

Therefore, the number of grams of Na₂CO₃ required is;

Mass of Na2CO3 = Number of moles of Na2CO3 × Molar mass

Mass of Na2CO3 = 0.00075 mol × 106 g/mol = 0.0795 g ≈ 1.05 g.

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Answer:

8000 cm3

Explanation:

First convert the 0.2 meters to cm which is 20, then multiply 20 cm x 20 cm x 20 cm which equals 8000 cm3. This is the correct one

The volume of a cube is given by the cube of the edge of the length given of the sides. The volume of the cube with a dimension of 0.2 m x 0.2 m x 0.2 m is 8000 cm³.

Volume is said to be the scalar quantity that measures the three-dimensional shape with a closed system. The volume has been given in cubic centimeters and cubic meters, which is a derived unit of length (meter).

The volume of a cube is given by the length of its sides as a³. The length of the dimension of the cube is 0.2 m x 0.2 m x 0.2 m.

Given,

a = 0.2 m

Here, 1 m = 100 cm

Then, 0.2 m = 20 cm

The volume of a cube is calculated as:

The volume of the cube = a³

= 20 cm x 20 cm x 20 cm

= 8000 cm³

Therefore, the volume of a cube with dimensions 0.2 m x 0.2 m x 0.2 m is 8000 cm³.

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A "collage model" typically refers to a two-dimensional artwork created by combining different materials, such as photographs, paper, fabric, and other found objects, to create a new image. Collage is a technique widely used in art and design, particularly in fields such as graphic design, advertising, and illustration.

On the other hand, a "three-dimensional model" refers to a physical object that has height, width, and depth, also known as 3D. It can be made of different materials, such as wood, plastic, metal, or even digital models using computer software. Three-dimensional models are used in many fields, such as architecture, engineering, product design, and entertainment.

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Answer:

It’s actually 130 degrees Celsius.

Explanation:

3.45g sulfuric acid will be present in the mixture after the reaction is complete.

H₂SO₄ (aq) + Pb(CH₃COO)₂ (aq) ⇌ PbSO₄ (s) + 2 CH₃COOH (aq)

1 mole of sulphuric acid reacts with 1-mole lead(II) acetate to give 1-mole lead(II) sulfate and 2-mole acetic acid.

Mass of lead acetate reacting = 5.00g

Mass of sulphuric acid reacting = 5.00 g

Now, calculating the no. of moles of each reactant involved:

No. of moles = \(\frac{Given mass of substance}{Molar mass of substance}\)

Moles of sulphuric acid = \(\frac{5.00g}{98.08g}\)  

                                       = 0.510 mol

Moles of lead acetate = \(\frac{5.00g}{325.29g}\)

                                    = 0.0158 mol

Thus,  0.0158 moles of lead acetate will react with 0.0510 moles of sulphuric acid to give 0.0158 moles of lead sulfate and 0.0158 × 2 = 0.0316 moles of acetic acid.

Therefore, only 0.0158 moles of sulphuric acid will react.

So, the remaining moles = 0.510 - 0.0158

                                         = 0.0352 mol

Remaining mass of sulphuric acid = 0.0352 × 98.08

                                                        = 3.45g

Hence, 3.45g sulfuric acid will be present in the mixture after the reaction is complete.

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Solutions of sulfuric acid and lead (II) acetate react to form solid lead (II) sulfate and a solution of acetic acid, 5.00 g of sulfuric acid, and 5.00 g of lead(II) acetate are mixed. Calculate the number of grams of sulfuric acid present in the mixture after the reaction is complete.

Answer:

27.5 mL of 6.00 M HCl solution is required to react with 5.65 g of Zn(s)

Given: Mass of Zn = 5.65 g

The equation of the reaction is

Zn(s)+ 2 HCl(aq) → ZnCl2(aq) + H2(g)

Calculate the number of moles of Zn.

Zn → 65.38 g/mol

Number of moles of Zn = Mass of Zn/Molar mass of Zn

= 5.65 g/65.38 g/mol

= 0.0863 mol

According to the balanced chemical equation, 1 mole of Zn reacts with 2 moles of HCl.

Number of moles of HCl required = 2 × 0.0863 mol

= 0.165 mol

The molarity of HCl is given to be 6.00 M.

Molarity = number of moles/volume of solution in litres

0.165 M = 6.00 M/Volume of solution in litres

Volume of solution in litres = 0.165 M/6.00 M

= 0.0275 L = 27.5 mL

Therefore, 27.5 mL of 6.00 M HCl solution is required to react with 5.65 g of Zn(s).

27.5 mL of 6.00 M HCl solution is required to react with 5.65 g of Zn(s).

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Answer: Magnesium loses two electrons whilst sulfur gains tw

Solubility means the ability of a solute to dissolve in solvent to form a solution.

Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a particular temperature.

The solute can be a solid, liquid or a gas.

The solubility of a solid or a liquid solute in a solvent is affected by the temperature, while the solubility of a gaseous solute is affected by both the temperature and the pressure of the gas.

Therefore, Solubility means the ability of a solute to dissolve in solvent to form a solution.

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Answer:

2

Explanation:

because 100÷50=2m÷v=d

Answer:

it will dilute to its natrual state. so c

Explanation:

Benzene + CH3Cl/AlCl3 → Toluene AND Toluene + H2SO4/H3PO4 → p-toluenesulfonic acid the synthesis of o-bromonitrobenzene and p-toluenesulfonic acid starting from benzene.

1. To make o-bromonitrobenzene from benzene, you would need to first convert benzene to nitrobenzene by reacting it with nitric acid in the presence of sulfuric acid. This reaction is called nitration.

Once you have nitrobenzene, you can then react it with bromine in the presence of a catalyst such as iron or aluminum bromide to produce o-bromonitrobenzene. The reaction is called bromination.

Overall reaction:

Benzene + HNO3/H2SO4 → Nitrobenzene
Nitrobenzene + Br2/Fe or AlBr3 → o-bromonitrobenzene

2. To make p-toluenesulfonic acid from benzene, you would first need to convert benzene to toluene by reacting it with methyl chloride in the presence of a Lewis acid catalyst such as aluminum chloride. This reaction is called Friedel-Crafts alkylation.

Once you have toluene, you can then react it with sulfuric acid in the presence of a catalyst such as phosphoric acid to produce p-toluenesulfonic acid. The reaction is called sulfonation.

Overall reaction:

Benzene + CH3Cl/AlCl3 → Toluene
Toluene + H2SO4/H3PO4 → p-toluenesulfonic acid
the synthesis of o-bromonitrobenzene and p-toluenesulfonic acid starting from benzene.

1. To synthesize o-bromonitrobenzene:
Step 1: Nitration of benzene - Treat benzene with a mixture of concentrated nitric acid (HNO3) and concentrated sulfuric acid (H2SO4) to form nitrobenzene.
Step 2: Bromination of nitrobenzene - Treat nitrobenzene with bromine (Br2) in the presence of iron(III) bromide (FeBr3) as a catalyst to obtain o-bromonitrobenzene.

2. To synthesize p-toluenesulfonic acid:
Step 1: Friedel-Crafts alkylation - Treat benzene with methyl chloride (CH3Cl) in the presence of aluminum chloride (AlCl3) as a catalyst to form toluene.
Step 2: Sulfonation of toluene - Treat toluene with concentrated sulfuric acid (H2SO4) at high temperature (100-130°C) to obtain p-toluenesulfonic acid.

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Ethanol use was effect the shortage of corn available on those time because of corn is an ingredient to produce the ethanol. Hence, ethanol use was aligned with the rarity of corn availability on those time. the more ethanol was used, the more rare corn availability for consumer.  

The drought is a condition where the area cant provide enough water supply for a long. Agriculture sector is the most affected sector when the drought occur. The drought cause crop failure, and this condition create domino effect on another sector such as food price get more expensive, and because of food get more expensive, buying power getting low cause small business out of business.

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Answer:C

Explanation: Done by reading and is best answer option.

Answer:

Iodine 131 is an unstable/radioactive isotope of iodine and a normal atom of iodine is stable.

Explanation:

Answer:

1.correct

3.correct

Explanation:

pls mark me as brainliest

Answer:

I believe A is the correct answer.

Explanation:

I note that another response includes C. as another correct answer.  It is possible, but it depends on what is meant by "fixed shape."  I interpret "fixed shape" as the collection of the gases forming a fixed shape on their own.  Gases fill the container they are in (be it a flask, room, or a planet, so they have a fixed shape by that definition.  But a primary definition of gases is that that take on the shape of their container, not a shape of their own.

A. is correct because perfect gases have no interactions (AKA the Ideal Gas Laws).  They may have interactions, and often do, but they are weak.  That's why the ideal gas laws are a good first approximation to how gases change volume based on temperature and pressure.

Answer: C. that there may be more than one way to interpret data

Enge 2020 C is the correct answer

In the electron transport chain, protons are pumped into the intermembrane space as electrons are moved along, which is known as the chemiosmotic gradient.

This process takes place in the mitochondria of eukaryotic cells and in the plasma membrane of prokaryotic cells. The electron transport chain consists of a series of protein complexes that transfer electrons from electron donors to electron acceptors via redox reactions. These reactions release energy, which is used to pump protons across the membrane, creating a proton gradient.

The potential energy stored in this gradient is then utilized by the enzyme ATP synthase to synthesize ATP (adenosine triphosphate), the primary energy currency of the cell. Overall, the electron transport chain plays a critical role in cellular respiration, enabling the efficient production of ATP and supporting various cellular processes. In the electron transport chain, protons are pumped into the intermembrane space as electrons are moved along, which is known as the chemiosmotic gradient.

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Answer:

c

Explanation:

QUESTION :WHAT TYPE OF BOND IS CA + AR

ANSWER :

C .

COVALENT.

HOPE IT HELP

THANK ME LATER.

Answer:A - The Moon Takes Longer To Rotate Than To Revolve Around Earth

A mutation from alanine to glycine can often lead to a very unstable protein. The reason for this instability can be attributed to the differences in the side chains of these two amino acids.

Alanine has a methyl (\(CH_3\)) side chain, while glycine has a hydrogen (H) side chain. The presence of the methyl group in alanine allows for more stable hydrophobic interactions within the protein structure, which contribute to the overall stability of the protein. In contrast, glycine's hydrogen side chain is unable to form these stabilizing hydrophobic interactions.

When a mutation occurs and alanine is replaced by glycine, the loss of the hydrophobic interactions can result in a less stable protein structure. This can lead to improper folding or increased susceptibility to denaturation, ultimately causing the protein to be unstable.

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At STP, there are 0.0446 moles of oxygen in 1000 mL

n = (V / Vm)

where n is the number of moles, V is the volume of the gas in liters, and Vm is the molar volume of the gas at STP (22.4 L/mol).

Converting the given volume of 1000 mL to liters:

V = 1000 mL = 1 L

Substituting the values into the formula:

n = (1 L) / (22.4 L/mol) = 0.0446 mol

STP stands for Standard Temperature and Pressure, which are standardized conditions used in chemistry to compare and measure the properties of gases. The standard temperature is defined as 0°C (273.15 K), while the standard pressure is 1 atmosphere (atm) or 101.325 kilopascals (kPa).

At STP, one mole of any gas occupies a volume of 22.4 liters. This value is known as the molar volume and is useful in various chemical calculations. Additionally, the ideal gas law, which relates the pressure, volume, and temperature of a gas, is often used at STP conditions to simplify calculations. STP is essential for defining and comparing gas properties, as different gases behave differently under different conditions.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 250 mL

density = 0.789 g/ml

So we have

mass = 250 × 0.789

We have the final answer as

Hope this helps you

Answer:

A

Explanation:

proton

The term absorbance is directly proportional to the concentration (c) of the solution which is used in the experiment of the spectra.

The absorbance is defined as the term which is said to be directly proportional to the length of the light path that is equal to the width of the cuvette. The relationship between concentration and absorbance can be explained by the Beer-Lambert law. This law relates the attenuation of light to the properties of a material. The Beer-Lambert law is defined as the law which states that the concentration of a chemical solution is directly proportional to its absorption of light.

The acid dissociation constants were determined in the spectra will be 2.97 pKa* and 9.47 pKa. The pKa and pKa* values are corresponded well with literature values of 9.45 and 3.0 with a 0.2 and 1.0% difference, respectively. This was determined that 2-naphthol is a weaker acid in the ground state than the excited state due to the value of  pKa > pKa.

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