The heat of solution of KI is 20.3 kJ/mol.
This means that when one mole of KI dissolves in water the process will be
PLEASE EXPLAIN ANSWER

a. Exothermic, ΔH is positive
b. Exothermic, ΔH is negative
c. Endothermic, ΔH is negative
d. Endothermic, ΔH is positive

The expression relating the concentration of a gas in \(\mu g/m^-^3 (X)\) with the concentration expressed in ppm (Y) is \(Y = (X/MW) * 10^6 / V\)

To derive an expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y), we can use the ideal gas law. The ideal gas law states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation, we have \(n = PV/RT\)

To convert the concentration from \(\mu g/m^-^3 (X)\) to moles (n), we divide X by the molecular weight (MW) of the gas. Thus, \(n = X/MW\)

Combining the two equations, we have \(X/MW = PV/RT\)

Since the concentration expressed in ppm (Y) is the same as the number of moles per million parts of air, we can write \(Y = n * 10^6 / V\)

Substituting \(n = X/MW\), we get \(Y = (X/MW) * 10^6 / V\)

Therefore, the expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y) is:

\(Y = (X/MW) * 10^6 / V\)

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Complete question is:

Using the ideal Gas Law, derive an expression relating the concentration of a gas \(\mu_g^-^3 (X)\) with the concentration expressed in ppm (Y). (10 pts) Hint:- Ideal gas law \(PV= nRt -R = 0.0821 atm mol^-^1\)  −MW=X= molecular weight

B.

Explanation:

Viruses are like hijackers. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves. This can kill, damage, or change the cells and make you sick.

The mathematical formula for Avogadro's law is Vn=k V n = k, where V is the volume of the gas, n is the number of moles, and k is a proportionality constant.

Dermatologists advise monthly skin checks for their patients. Moles are mostly harmless. Consult a dermatologist to have your mole examined if you detect changes in its color or appearance. If moles bleed, ooze, itch, or appear scaly, you should also get them examined.

The most typical kind of melanoma typically manifests as a flat or scarcely elevated lesion with wavy margins and a range of colors. The melanomas in 50% of these moles are pre-existing moles.

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Answer:

d

Explanation:

Answer:

number of protons

Explanation:

The number of protons determines an element's atomic number and is used to distinguish one element from another. 

Here hydroboration-oxidation, as well as oxymercuration-reduction, gives the same compound 1-cyclo pentanol.

A compound in linguistics is a lexeme (more precisely, a word or sign) composed of more than one stem. The process of word construction that results in compound lexemes is known as compounding, composition, or nominal composition.  An open compound or a spaced compound is one that uses a space rather than a hyphen or concatenation; the alternative is a closed compound.

The compound's meaning may be comparable to or distinct from the meanings of its constituents in isolation. With very few exceptions, the first component stem in English compound words is emphasized.

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The concentration of Cd2+ ion in the 0.022 M Cd(NO3)2 solution that is also 1.0 M NH3 at this temperature,

Kf for Cd(NH3)42+ is 1.0 × 10−5 M.

The given constants are:

Temperature (T) = not given

Kf (Formation constant) for

[Cd(NH3)4]2+ = 1.6 x 10^7

Kf = (4)2 / ([Cd2+][NH3]4) [Cd2+]

= (4)2 / (Kf [NH3]4)

The given values are:

Initial concentration of Cd(NO3)2 solution = 0.022 M

Initial concentration of NH3 solution = 1.0 MCd2+ is a part of complex ion, Cd(NH3)42+.

Cd2+ forms a complex ion by reacting with four NH3 molecules.  

Cd2+ + 4NH3 ⇌ Cd(NH3)42+

In this reaction, Cd2+ ion reacts with four NH3 molecules to form Cd(NH3)42+ complex ion.

Cd2+ has an equilibrium constant (Kf) of 1.6 x 107 for the complex ion formation.

Cd2+ and NH3 react to form the complex ion, Cd(NH3)42+ as follows:

[Cd2+][NH3]4 ⇌ [Cd(NH3)4]2+

We know that

Kf = ([Cd(NH3)4]2+ ) / ([Cd2+][NH3]4)

Kf = 1.6 × 107

= [Cd(NH3)4]2+ / ([Cd2+][NH3]4) [Cd2+]

= 4^2 / (Kf [NH3]4)[Cd2+]

= (4^2) / (1.6 × 107 × 1.0^4)[Cd2+]

= 1.0 × 10−5 M

Therefore, the concentration of Cd2+ ion in the 0.022 M Cd(NO3)2 solution that is also 1.0 M NH3 at this temperature,

Kf for Cd(NH3)42+ is 1.0 × 10−5 M.

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LEAST TO MOST POLAR- hexane,diethyl ether,acetone,n-propanol,water ,methanol

Considering the problem  we can say that the kids are compared to be more polar or smaller molecular weight compounds. The more polar compounds interact with silica more just as the kids bus stopped at every point and reached the destination late. Whereas, the adult bus is compared to be less polar compounds or high molecular weight which interacts less and reaches the destination faster.

Thus more polar compounds reaches the destination late whereas less polar compound reaches first.

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mol = 0.75 L(750 ml) x 0.132 mol/L =0.099 mol

potassium carbonate: K₂CO₃ ⇒ MM = 138,205 g/mol

mass = 0.099 x 138.205 = 13.68 g

Water is an excellent solvent for most ionic compounds and polar covalent molecules but not for non-polar compounds because of its content loaded with certain chemical properties that make it a highly effective solvent. Water molecules are polar, and due to their dipolar nature, the oxygen atom carries a negative charge while the hydrogen atoms carry a positive charge.

The polarity of the water molecule allows it to interact with and dissolve other polar and ionic substances.When an ionic compound is dissolved in water, the ions of the compound dissociate into individual charged species (cations and anions), and these charged species are solvated by water molecules. The polarity of the water molecule allows it to interact with the ions by attracting the positively charged ions to the negative end of the water molecule and vice versa.

The same is true for polar covalent molecules, which have a net dipole moment. Water molecules can interact with these molecules, forming a solvation layer around them. On the other hand, non-polar compounds lack a net dipole moment, so they don't interact with the water molecules. Instead, non-polar compounds interact with each other via van der Waals forces, making it more challenging for them to dissolve in water.

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According to mole concept there are 1242.14 g  in 7.57 moles of calcium nitrate .

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Mass of calcium nitrate is calculated from number of moles formula as, mass= number of moles ×molar mass

On substitution in above formula , mass=164.088×7.57=1242.146 g

Thus, 1242,146 g is present in 7.57 moles of calcium nitrate.

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Answer:

A I think

Explanation:

The amount of ethanol adsorbed per gram of activated carbon can be calculated using the given information. The moles of butanol in the solution before adsorption, which is 2M x 0.02L = 0.04 moles.

Then, we calculate the moles of butanol adsorbed on activated carbon, which is 1.3M x 0.02L = 0.026 moles. Finally, we subtract the moles of butanol adsorbed from the initial moles to find the moles of ethanol adsorbed, which is 0.04 moles - 0.026 moles = 0.014 moles.

To find the amount of ethanol adsorbed per gram of activated carbon, we need to calculate the moles of butanol in the solution before adsorption and the moles of butanol adsorbed on activated carbon.

First, we calculate the moles of butanol in the solution before adsorption. Given that the volume is 20 mL and the concentration is 2M, we can use the formula Moles = Concentration x Volume to find the moles of butanol. This gives us 2M x 0.02L = 0.04 moles of butanol.

Next, we calculate the moles of butanol adsorbed on activated carbon. Given that the final concentration is 1.3M and the volume is still 20 mL, we can use the same formula to find the moles of butanol. This gives us 1.3M x 0.02L = 0.026 moles of butanol.

Finally, to find the moles of ethanol adsorbed, we subtract the moles of butanol adsorbed from the initial moles of butanol. This gives us 0.04 moles - 0.026 moles = 0.014 moles of ethanol adsorbed.

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Answer:

H2Br + 2KOH ----- K2Br + 2H2O

Answer:

Immune system

Explanation:

There isn't really one, just that the immune system keeps us as a species alive, it prevents spreadable diseases that could wipe out or species

Answer:

1.88 g

Explanation:

n(moles) = mass/molar mass

mass = moles x molar mass of nickel

mass = 3.21x10^-2 x 58.69

mass = 1.883949 grams

mass = 1.88 g (2dp)

Hope this helps :)

Answer:

uhm

Explanation:

The number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

To determine the number of molecules in a 37.93 gram sample of magnesium nitrate, you would need to know the molar mass of the compound. Magnesium nitrate has a molar mass of 148.31 g/mol.

we can use the formula:

Number of moles = mass (in grams) / molar mass (in g/mol)

Number of moles = 37.93 g / 148.31 g/mol = 0.2568 mol Avogadro's number (6.022x10^23) is the number of atoms, ions, or molecules in one mole of a substance. Therefore, the number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

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Reaction B releases more energy than reaction A releases.The correct option is B)

The energy released by these reactions can be evaluated using the concept of nuclear binding energy. Nuclear binding energy is defined as the amount of energy required to break up a nucleus into its individual nucleons (protons and neutrons). This energy is a measure of the strong nuclear force that holds a nucleus together.

Reaction A involves the formation of a sodium chloride molecule by the transfer of one electron from a sodium atom to a chlorine atom. The energy released in this reaction is due to the formation of ionic bonds between the positively charged sodium ion and negatively charged chloride ion.

The energy released in this reaction is relatively low compared to nuclear reactions.In contrast, reaction B involves the decay of an oxygen isotope to form a nitrogen isotope, releasing a large amount of energy. The decay of an isotope involves the spontaneous breakdown of its nucleus due to a variety of factors.

This process releases a large amount of energy in the form of radiation and kinetic energy of the decay products.The energy released by nuclear reactions is much larger than that released by chemical reactions, such as reaction A. Therefore, option B, Reaction B releases more energy than reaction A releases, is the best description of the energy released per gram by these reactions.

Option B
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CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

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Answer:

it's already Balanced

MgO + Li2SO4 ---------✓ MgSO4 + Li2O

Answer:

540.47g approximately

Explanation:

No. of moles in Na₂CO₃ = 5.4 moles

Mole ratio of Na₂CO₃ : CaCO₃ = 1:1

No. of moles in CaCO₃ = 5.4 moles

Mass of CaCO₃ = 5.4 × 100.0869

= 540.46926g

The equation for the combination of these half-cell reactions that leads to the largest positive emf is,

2Au(s) + 8Br⁻ +3IO⁻ (aq) + 3H2O(l) →  2AuBr4⁻ (aq) + 3I⁻ (aq) + 6OH⁻ (aq)

The combination where the anode has the lowest standard reduction potential will provide the maximum positive emf. The maximum standard reduction potential is in the cathode.

It is required to check the reduction potential values

AuBr⁻⁴(aq)+3e− → Au(s) + 4Br−(aq)  [Lowest]

E∘red = −0.858V

Eu³⁺(aq) + e− → Eu²⁺(aq)

E∘red = −0.43V

IO−(aq) + H₂O(l)+2e− → I−(aq) + 2OH−(aq) [Highest]

E∘red = +0.49V

Sn2+ (aq) +2e− → Sn(s)

E∘red = −0.14V

Thus, the cell reaction will be:

2Au(s) + 8Br⁻ +3IO⁻ (aq) + 3H2O(l) →  2AuBr4⁻ (aq) + 3I⁻ (aq) + 6OH⁻ (aq)

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A mixture of hydrogen gas, neon gas, and chlorine gas were stored in a 5 L flask at a constant temperature of 250K. The correct answer is "they all have the same average kinetic energy".

According to the kinetic theory of gases, the average kinetic energy of a gas is directly proportional to its temperature and is independent of the gas's identity or molar mass. In this case, all the gases (hydrogen, neon, and chlorine) are at the same temperature of 250K.

Therefore, they all have the same average kinetic energy.

The average kinetic energy of a gas is calculated using the equation:

KE_avg = (3/2) * k * T

where KE_avg is the average kinetic energy, k is the Boltzmann constant, and T is the temperature in Kelvin. Since the temperature is constant for all the gases, their average kinetic energies will be equal.

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Given the same temperature, all gases have the same average kinetic energy regardless of the gas type. Therefore, hydrogen, neon, and chlorine all have the same average kinetic energy at 250K.

The average kinetic energy of particles in a gas depends only on the temperature of the gas, according to the kinetic molecular theory. Since the temperature (250K) is the same for all the three gases (hydrogen, neon, and chlorine), they will all have the same average kinetic energy. No matter their masses or the number of molecules present, these factors won't affect their average kinetic energy at a constant temperature. Therefore, hydrogen gas, neon gas, and chlorine gas stored in a 5 L flask at the constant temperature of 250K will have the same average kinetic energy.

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During one round of the citric acid cycle, a molecule of Acetyl CoA yields the following:

3 molecules of NADH

1 molecule of FADH2

1 molecule of GTP

2 molecules of CO2

During one round of the citric acid cycle, a molecule of Acetyl CoA yields the following:

3 molecules of NADH: NADH (nicotinamide adenine dinucleotide) is a high-energy electron carrier. It is produced in three different reactions during the citric acid cycle. NADH carries the electrons to the electron transport chain, where they are used to generate ATP.

1 molecule of FADH2: FADH2 (flavin adenine dinucleotide) is another electron carrier. It is produced in one specific reaction during the citric acid cycle. Like NADH, FADH2 also delivers electrons to the electron transport chain for ATP production.

1 molecule of GTP: GTP (guanosine triphosphate) is a high-energy nucleotide that is generated during one specific step of the citric acid cycle. GTP can be directly converted into ATP, providing a source of cellular energy.

2 molecules of CO2: Two molecules of carbon dioxide are released as byproducts during the citric acid cycle. These CO2 molecules represent the carbon atoms that were originally present in the acetyl group of Acetyl CoA.

In summary, during one round of the citric acid cycle, a molecule of Acetyl CoA yields 1 molecule of GTP, 3 molecules of NADH, 1 molecule of FADH2, and 2 molecules of CO2.

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Answer:

"3. Energy can either be destroyed or created. Its goes from one form to another."  

Explanation:

The third answer choice, "3. Energy can either be destroyed or created. Its goes from one form to another. " is related to the Law of Conservation of Energy from thermodynamics. Is it not a postulate of the Kinetic Molecular Theory.

"1. Average Kinetic Energy of the system is a measure of the temperature of the system."

Postulate of Kinetic Molecular Theory \(\checkmark\)

"2. Energy is conserved in the collisions between gas molecules.."

Postulate of Kinetic Molecular Theory \(\checkmark\)

"3. Energy can either be destroyed or created. Its goes from one form to another.

\(\times\) NOT a Postulate of Kinetic Molecular Theory

"4. Gases travel in straight line until they collide with other gas molecules"

Postulate of Kinetic Molecular Theory \(\checkmark\)

30.06904 grams of C2H6 are formed from 9.5 moles of CO2 gas.

How to find number of moles?

In the International System of Units, the mole is the unit of substance amount. A mole of a substance is defined as a mass of material that contains exactly 12,000 g of 12C's exact number of atoms as fundamental units. One mole has 600 sextillion molecules. While employing the mole, complicated calculations are more easily understandable. To get the number of moles, divide the compound's known mass by its molar mass. Consider a scenario where your sample of Na2SO4 weighs 20 g. 20 grammes divided by 142 grammes per mole yields 0.141 moles.

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