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blsea [12.9K]
4 years ago
7

Given 7.65 mol AgNO3, determine the number of formula units.

Chemistry
1 answer:
Komok [63]4 years ago
3 0

Answer:

The number of formula units of silver nitrate is 4.61\times 10^{24}.

Explanation:

Moles of silver nitrate = n = 7.65 mol

1 mole = N_A=6.022\times 10^{23} atoms/ molecules/ ions

Let the number of formula units of silver nitrate be N.

N=n\times N_A

N=7.65 mol\times 6.022\times 10^{23}=4.61\times 10^{24}

The number of formula units of silver nitrate is 4.61\times 10^{24}.

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The enthalpy change for the formation step of this intermediate is 136 kJ/mol.

<h3>What is the enthalpy?</h3>

The enthalpy of reaction can be obtained from the enthalpies of formation of the species involved. The enthalpy of reaction is the heat evolved or absorbed in a reaction.

Thus, the enthalpy change for the formation step of this intermediate is 4 *  34 kJ/mol = 136 kJ/mol.

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2 years ago
A chemist adds a sample of an ideal gas to a balloon and measures its volume. The chemist removes some of the gas from the ballo
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Answer:

The volume of the gas decreases also in a 21% based on the Avogadro's law

Explanation:

Based on Avogadro's law, the volume of a gas is directely proportional to the amount of moles of gas when temperature and pressure remain constants.

The formula is:

V1 / n1 = V2 / n2

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<em />

At beginning, V1 = 100%, n1 = 100%,

As the chemist removes 21% of the gas, 79% of moles remain = n2.

Replacing:

100% / 100% = V2 / 79%

V2 = 79%, that means:

<h3>The volume of the gas decreases also in a 21% based on the Avogadro's law</h3>
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