In the equilibrium constant expression for Equation 2, [H2O] is omitted because the salt is:A. only weakly basic, and [H2O] is nearly constant.B. strongly basic, and [H2O] is nearly zero.C. only weakly acidic, and [H2O] is nearly constant.D. strongly acidic, and [H2O] is nearly zero.

Answer:

The basic thing that all things are made up of

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore,  the volume of oxygen needed to completely react with 171.9 g of S8 at STP is 180.09L.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

S\(_8\)(s) +12O\(_2\)(g) →8SO\(_3\)(l)

171.9 g of S8

mole of  S\(_8\)=  171.9 g/ 256.52g/mol

                 =0.67mol

The mole of oxygen = 12×0.67

                                = 8.04mol

volume of oxygen= 22.4× 8.04

                            =180.09L

Therefore,  the volume of oxygen needed to completely react with 171.9 g of S8 at STP is 180.09L.

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B) Chlorine typically takes around 10 minutes to kill almost all microorganisms, excluding endospores. Its strong oxidizing properties disrupt the cellular structures and metabolic processes of microorganisms, leading to their inactivation or death.

Almost all microorganisms, excluding endospores, are killed by chlorine in approximately 10 minutes. Chlorine is commonly used as a disinfectant due to its ability to effectively kill a wide range of microorganisms, including bacteria, viruses, and fungi.

The disinfection process involves exposing the microorganisms to chlorine, which acts as a strong oxidizing agent. Chlorine disrupts the cellular structures and metabolic processes of microorganisms, leading to their inactivation or death.

While the exact time required for chlorine to kill microorganisms may vary depending on factors such as concentration, temperature, and the specific microorganism being targeted, 10 minutes is a commonly cited duration for effective disinfection.

It is important to note that endospores, which are highly resistant structures formed by certain bacteria, are not easily killed by chlorine. Endospores have a protective outer layer that shields them from the disinfecting effects of chlorine, requiring more prolonged exposure or alternative disinfection methods to eliminate them effectively.

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Answer:1.59

Explanation: For every mol of Ca(OH)2 there are two moles of OH so the concentration of OH is .013 x2 =.026 M OH

pOH = - log [OH] so -log .026 = 1.59

pOH is the negative logarithm of hydroxide ion concentration. 1.59 is the pOH of a 0.013 M Ca(OH)₂ solution.

The term pOH is defined as the negative of the logarithm of the OH− ion concentration. It is represented by the formula  pOH = - log [OH−].

pOH is the activity of acidity or alkalinity of a solution by determining the concentration of OH− ions.

If the pOH value is less than 7, the solution is basic. If the pOH value is equal to 7, the solution is neutral. If the pOH value is more than 7, the solution is acidic.

For every mol of Ca(OH)₂ there are two moles of hydroxide therefore, the concentration of OH is 0.013 x 2 = 0.026 M OH

According to the formula of pOH

pOH = - log [OH]

-log .026 = 1.59

Thus, the pOH of a 0.013 M Ca(OH)₂ solution is 1.59.

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Answer:

The Gravitational Force of the Earth and Moon on Each Other. According to Newton's Third Law of Motion, the Law of Action and Reaction, if the Earth exerts a force on the Moon, the Moon must exert an equal and opposite force on the Earth.

A. The number of moles of water that were absorbed is 0.094 mole

B. The percentage of water in the hydrate is 25.4%

The number of mole water absorbed can be obtain as follow:

Mole = mass / molar mass

Mole of water = 1.70 / 18

Mole of water = 0.094 mole

We can obtain the percentage of water as follow:

Percentage of water = (mass of of water / mass of hydrate) × 100

Percentage of water = (1.7 / 6.7) × 100

Percentage of water = 25.4%

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Answer:

7.1 g

Explanation:

A way to figure this out is by using the molecular formula.

\(Na + Cl\) ⇒ \(NaCl\)

(Sodium + Chloride ⇒ Sodium Chloride)

From this formula it's one mol sodium + one mol chloride = one mol of sodium chloride.

Then you can substitute the values:

4.6 grams sodium + x grams chlorine = 11.7 g of sodium chloride

By using algebra you get:

x = 11.7 - 4.6 = 7.1 g

You can check this by using the molar masses of sodium and chlorine which can take a more time and is kind of unnecessary.

Hope that helps!

Answer:

\(\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}\)

Answer:

Nucleus

Explanation:

Since electrons are 1/1840 of the weight of a proton or a neutron, all of which are in the nucleus, scientists often don't include them.

Answer: The reaction between benzil and dibenzyl ketone to form 1,2-dibenzylidenecyclohexanone is:

2 C14H12O + NaOEt → C20H18O + H2O + NaOAc

The molar mass of benzil is 210.25 g/mol, and the molar mass of dibenzyl ketone is 234.30 g/mol. Using the given masses of each reactant, we can calculate the number of moles of each:

moles of benzil = 0.3 g / 210.25 g/mol = 0.001426 mol

moles of dibenzyl ketone = 0.5 g / 234.30 g/mol = 0.002133 mol

Based on the balanced equation, the stoichiometric ratio between benzil and dibenzyl ketone is 1:1, meaning they react in a 1:1 ratio. Since the number of moles of benzil is less than the number of moles of dibenzyl ketone, benzil is the limiting reagent.

To find the theoretical yield of the product, we need to determine the amount of the limiting reagent that reacts. Since benzil is the limiting reagent and reacts in a 1:1 ratio with dibenzyl ketone, the moles of product formed will also be equal to 0.001426 mol.

The molar mass of the product is 286.37 g/mol. Using the moles of product, we can calculate the theoretical yield:

theoretical yield = 0.001426 mol x 286.37 g/mol = 0.408 g or 408 mg

Therefore, the theoretical yield for this reaction is 0.408 g or 408 mg.

Answer:

Explanation:

Here, we want to get the mass of carbon (iv) oxide produced

From the question, we have the balanced chemical reaction stating that 2 moles of oxygen molecule produced 1 mole of carbon (iv) oxide molecule

The number of moles of carbon (iv) oxide produced from 7.34 mol oxygen is thus:

1 mole of carbon (iv) oxide contains 44 g

The mass in 3.67 moles will be:

Answer:

Thorium

Explanation:

I hope it's correct ;))

The balanced chemical equation for the decomposition of potassium chlorate is:

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

According to the equation, 2 moles of KCl are produced for every 2 moles of KClO3 that decompose. The molar mass of KClO3 is 122.55 g/mol, while the molar mass of KCl is 74.55 g/mol. Therefore, we can use the following steps to calculate the amount of KCl produced:

Calculate the number of moles of KClO3:

moles of KClO3 = mass of KClO3 / molar mass of KClO3

moles of KClO3 = 25 g / 122.55 g/mol

moles of KClO3 = 0.2036 mol

Use the mole ratio from the balanced equation to find the number of moles of KCl produced:

moles of KCl = moles of KClO3 x (2 moles of KCl / 2 moles of KClO3)

moles of KCl = 0.2036 mol x (2/2)

moles of KCl = 0.2036 mol

Calculate the mass of KCl produced:

mass of KCl = moles of KCl x molar mass of KCl

mass of KCl = 0.2036 mol x 74.55 g/mol

mass of KCl = 15.18 g

Therefore, 15.18 grams of potassium chloride are produced if 25 grams of potassium chlorate decompose.

The molarity of the hydrogen peroxide solution is calculated to be 0.367875 M.

To determine the molarity of the hydrogen peroxide solution, we can use the balanced chemical equation for the reaction between hydrogen peroxide and permanganate ion:

2MnO4– + 5H2O2 + 6H+ → 2Mn2+ + 5O2 + 8H2O

From the equation, we can see that the ratio of MnO4– to H2O2 is 2:5. Since it takes 13.5 mL of 0.109 M MnO4– to reach the equivalence point, we can calculate the moles of MnO4– used:

moles MnO4– = volume (L) × molarity (mol/L)

= 0.0135 L × 0.109 mol/L

= 0.0014715 mol

Using the ratio, we can calculate the moles of H2O2:

moles H2O2 = (moles MnO4–) × (5/2)

= 0.0014715 mol × (5/2)

= 0.00367875 mol

To find the molarity of the H2O2 solution, we divide the moles of H2O2 by the volume (in L) of the solution titrated:

molarity H2O2 = moles H2O2 / volume (L) = 0.00367875 mol / 0.010 L = 0.367875 M

Therefore, the molarity of the hydrogen peroxide solution is 0.367875 M.

In this question, we are given the volume and molarity of the permanganate ion solution used in the titration of hydrogen peroxide. We can use stoichiometry and the balanced chemical equation to determine the moles of hydrogen peroxide. By dividing the moles of hydrogen peroxide by the volume of the solution titrated, we can find the molarity of the hydrogen peroxide solution.

To begin, we calculate the moles of permanganate ion used by multiplying the volume (in L) of the solution titrated by its molarity. Next, we use the stoichiometric ratio from the balanced chemical equation to calculate the moles of hydrogen peroxide. The ratio shows that for every 2 moles of permanganate ion, there are 5 moles of hydrogen peroxide.

By multiplying the moles of permanganate ion by (5/2), we obtain the moles of hydrogen peroxide. Finally, we divide the moles of hydrogen peroxide by the volume (in L) of the hydrogen peroxide solution titrated to determine its molarity.

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Mass number of the other isotope of gallium is 68.92amu

Percent abundance of gallium-71 (given) = 39.892%

Percent abundance of second isotope = 100.000 − 39.892 = 60.108%

Mass of gallium-71 (given) = 70.9247050 amu

Average atomic mass of gallium (from literature) = 69.72 amu

The average atomic mass of gallium is a weighted average of its two isotopes. We set up an equation for the average atomic mass of gallium using the data shown above and solve for "x", the mass of the second isotope:

69.72 amu= (0.39892)(70.92476050 amu) + (0.60108)x

69.72 = 28.29 + 0.60108x

41.43 = 0.60108x

x = 68.92amu

Chemistry's understanding of isotopes is crucial. A chemical element atom with the same number of protons but a different number of neutrons is what we are referring to here. The majority of elements in nature are composed of two or more distinct isotopes rather than existing as a single isotope. Each element therefore has a unique isotope distribution, with the abundances of each isotope being expressed as percent values that add up to 100%. A weighted average of an element's various isotope masses is actually used to determine the standard atomic weight (average atomic mass) that is listed in periodic tables or other publications.

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To solve this we must be knowing each and every concept related to rock and its characteristics. Therefore, the two characteristics of the rock can be given as below.

The word rock relates to the material's bulk volume, which includes the grain or crystals in addition to the enclosed vacuum space.

The two characteristics of the rock are:

Some minerals exhibit color features related to mineral composition and atom arrangement: for example, magnetite is black, chlorite is green, and pyrite is brassy yellow.

The capacity of a mineral to resist scratching is used to estimate its hardness, which is generally determined on fresh material. When a mineral is scraped with a knife, it softens. If a knife cannot scratch it, the two have equivalent hardness or even the mineral is harder.

Therefore, the two characteristics of the rock can be given as above.

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The limiting reactant in the reaction is oxygen, as it produces 0. 20 mol of NO. Thus, option A is correct.

The limiting reactant in the chemical reaction is the reactant that is present in the lesser concentration with the another reactant and decides the product formation.

The balanced equation for ammonia dissociation is:

\(\rm 4\;NH_3\;+\;5\;O_2\;\rightarrow\;4\;NO\;+\;6\;H_2O\)

The moles of ammonia require is 4 moles to react with 5 moles of oxygen

The moles has been given as:

\(\rm Moles=\dfrac{Mass}{Molar\;mass}\)

The available moles of ammonia in 4 gram is:

\(\rm Moles\;ammonia=\dfrac{4}{17}\\ Moles\;ammonia=0.23\;mol\)

The available moles of oxygen in 8 grams is:

\(\rm Moles\;oxygen=\dfrac{8}{32}\\ Moles\;oxygen=0.25\;mol\)

The moles of oxygen required for 0.23 moles of ammonia are:

\(\rm 4\;mol\;ammonia=5\;mol\;oxygen\\0,23\;mol\;ammonia=\dfrac{5}{4}\;\times\;0.23\;mol\;oxygen\\ 0.23\;mol\;ammonia=0.28\;mol\;oxygen\)

The required moles of oxygen is 0.28 mol, however the available moles of oxygen are 0.25 mol. Thus, oxygen is the limiting reagent.

Thus, option A is correct.

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Dimensional analysis can only be used for time, distance, mass, speed, volume, and chemical quantities: False.

A dimensional analysis can be defined as an analysis of the relationships that exist between different physical quantities by identifying their fundamental (base) quantities, especially for the purpose of inferences.

Dimensional analysis is also referred to as unit-factor method or factor-label method and it is typically used to convert a different type of unit to another.

Generally, dimensional analysis can only be used for the following physical quantities:

In conclusion, a dimensional analysis cannot be used for chemical quantities such as a mole i.e it has no dimensional formula.

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Answer:

i guess none of these or 3.4% for 10%

Explanation:

I think the answer should be in the 30 to 40 number scale

The change in entropy of the surroundings (ΔSsurr) for the given reaction at 48 °C is -0.178 kJ/K.

To calculate the change in entropy of the surroundings (ΔSsurr) for a reaction, we need to use the equation:

ΔSsurr = -ΔHrxn / T

where ΔHrxn is the enthalpy change for the reaction and T is the temperature in Kelvin.

Given:

ΔHrxn = 57.24 kJ

Temperature, T = 48 °C = 321 K (convert Celsius to Kelvin)

Using the given values in the equation, we get:

ΔSsurr = -ΔHrxn / T

ΔSsurr = -(57.24 kJ) / (321 K)

ΔSsurr = -0.178 kJ/K

Therefore, the change in entropy of the surroundings (ΔSsurr) for the given reaction at 48 °C is -0.178 kJ/K.

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The concentration of the HF solution is  0.03.

We know that the concentration has to do with the amount of the substance that is present in the system. We know that what we have is an acid hence we can only talk about the concentration of the acid if we can obtain the amount of the hydrogen ion.

We know that the acid is defined as any substance in which there is the presence of the hydrogen ion is what we call and acid. Since the hydrogen fluoride does have the hydrogen, we can say that the substance that we are dealing with here is an acid.

Thus;

pH = 14 - pOH

pOH = hydroxide ion concentration

pH = hydrogen ion concentration

pH = 14 - 12.5

= 1.5

[HF]  = Antilog (-1.5)

= 0.03

The acid would have a concentration of  0.03.

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The correct answer is A) Argon is a heavier atom than helium, so it has more mass in the same volume occupied by the gas.

The density of a gas is directly proportional to its molar mass. Since argon has a larger molar mass than helium, it will have a higher density than helium even if they both have the same number of moles. Therefore, option A is the correct explanation for the difference in densities. Option B is incorrect because the size of an atom does not necessarily determine its density. Option C is also incorrect because density is related to mass, not the density of individual atoms. Option D is incorrect because the difference in densities is not due to rounding.

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One of the following that is examples of a secondary pollutant is smog.

Secondary pollutants are pollutants that are not directly emitted by any source. Rather, they are formed in the atmosphere as a result of chemical reactions between primary pollutants and other atmospheric components. Some examples of secondary pollutants include:

Ozone

Nitrogen Dioxide

Sulfur Dioxide

Sulphuric Acid

Smog

VOCs

Carbon Monoxide

Smog is a form of air pollution caused by the reaction of sunlight with atmospheric pollutants, primarily nitrogen oxides and volatile organic compounds (VOCs).

Smog is a secondary pollutant because it is created through the reaction of two primary pollutants in the atmosphere.

Therefore, smog is an example of a secondary pollutant.

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To draw the product of an SN2 reaction and indicate stereochemistry:

1. Identify the substrate, nucleophile, and leaving group in the reaction.
2. Locate the carbon atom attached to the leaving group in the substrate. This is the electrophilic center.
3. The nucleophile will attack the electrophilic center from the opposite side of the leaving group, causing the leaving group to depart.
4. The nucleophile forms a bond with the electrophilic carbon, resulting in the formation of the product.
5. Since the nucleophile attacks from the opposite side, the stereochemistry at the electrophilic center will be inverted in the product.

To write the inorganic product in the answer palette, you should include the leaving group as a negatively charged anion (e.g., if the leaving group was Br, write Br-).

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