quanyoung88

07.04.2021 • 

Chemistry

At 298K, NH4NO3 readily dissolves in water, suggesting that the change in free energy (ΔG) favors the dissolution process. However, when NH4NO3 dissolves in water, the temperature of the water decreases. The particulate diagram above attempts to provide a microscopic view of the dissolution of NH4NO3(s) considering both the change in enthalpy (ΔH) and the change in entropy (ΔS). Which of the following explains what the particle diagram is able to illustrate and why? ANSWER CHOICES
A : The particle diagram is able to illustrate that the ΔH for the dissolution of NH4NO3 is exothermic because overcoming the attractive forces between the ions requires the absorption of energy.

B : The particle diagram is able to illustrate that the ΔH for the dissolution of NH4NO3 is endothermic because forming new interactions between the ions and the water molecules releases energy.

C : The particle diagram is able to illustrate that entropy increases when NH4NO3(s) dissolves in water because the ions disperse in solution.

D : The particle diagram is able to illustrate that entropy decreases when NH4NO3(s) dissolves in water because many hydrogen bonds can form between the water molecules and the ions.

Ответ:

taylorsamodell3217

07.01.2022

Chemistry

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A mole corresponds to the mass of a substance that contains 6.023 x 1023 particles of the substance. The mole is the SI unit for the amount of a substance. Its symbol is mol. By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 1023 of carbon atoms (to 10 significant figures). Examples
1. Equations

When we write chemical equations, the quantities are assumed to be in moles. For example, in the following reaction one mole of bromine gains two moles of electrons to form two moles of bromide ions:

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