Question

Which of the following salts shall cause more cooling when one mole of the salt is dissolved in the same amount of water? (Integral heat of solution at $298 \mathrm{~K}$ is given for each solute.) (a) $\mathrm{KNO}_{3} ; \Delta H=35.4 \mathrm{~kJ} / \mathrm{mol}$ (b) $\mathrm{NaCl} ; \Delta H=5.35 \mathrm{~kJ} / \mathrm{mol}$ (c) $\mathrm{KOH} ; \Delta H=-55.6 \mathrm{~kJ} / \mathrm{mol}$ (d) $\mathrm{HBr} ; \Delta H=-83.3 \mathrm{~kJ} / \mathrm{mol}$

Name: Problem 54, Chapter 5: Advanced Problems in Physical Chemistry for Competitive Examinations
Uploaded: 2022-01-30T19:43:38-08:00
Duration: 1 min 28 s
Channel: Amita Prajapat
Description: Which of the following salts shall cause more cooling when one mole of the salt is dissolved in the same amount of water? (Integral heat of solution at 298 K is given for each solute.) (a) KNO3 ; ΔH=35.4 kJ / mol (b) NaCl ; ΔH=5.35 kJ / mol (c) KOH ; ΔH=-55.6 kJ / mol (d) HBr ; ΔH=-83.3 kJ / mol

   Which of the following salts shall cause more cooling when one mole of the salt is dissolved in the same amount of water? (Integral heat of solution at $298 \mathrm{~K}$ is given for each solute.)
(a) $\mathrm{KNO}_{3} ; \Delta H=35.4 \mathrm{~kJ} / \mathrm{mol}$
(b) $\mathrm{NaCl} ; \Delta H=5.35 \mathrm{~kJ} / \mathrm{mol}$
(c) $\mathrm{KOH} ; \Delta H=-55.6 \mathrm{~kJ} / \mathrm{mol}$
(d) $\mathrm{HBr} ; \Delta H=-83.3 \mathrm{~kJ} / \mathrm{mol}$

Advanced Problems in Physical Chemistry for Competitive Examinations

Neeraj Kumar 2015 Edition

Chapter 5, Problem 54

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Solved by Expert Amita Prajapat

01/30/2022

Step 1

A positive value of ΔH indicates that the dissolution process is endothermic, meaning it absorbs heat from the surroundings, causing a cooling effect. A negative value of ΔH indicates that the dissolution process is exothermic, meaning it releases heat to the Show more…

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Which of the following salts shall cause more cooling when one mole of the salt is dissolved in the same amount of water? (Integral heat of solution at $298 \mathrm{~K}$ is given for each solute.) (a) $\mathrm{KNO}_{3} ; \Delta H=35.4 \mathrm{~kJ} / \mathrm{mol}$ (b) $\mathrm{NaCl} ; \Delta H=5.35 \mathrm{~kJ} / \mathrm{mol}$ (c) $\mathrm{KOH} ; \Delta H=-55.6 \mathrm{~kJ} / \mathrm{mol}$ (d) $\mathrm{HBr} ; \Delta H=-83.3 \mathrm{~kJ} / \mathrm{mol}$

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Key Concepts

Heat of Solution

This is a measure of the energy change when a solute dissolves in a solvent, typically expressed in kilojoules per mole. A positive heat of solution indicates that the process is endothermic, meaning that energy is absorbed from the surroundings during dissolution, which can result in a cooling effect.

Endothermic Dissolution

This concept refers to the dissolving process in which the system absorbs heat from its surroundings, leading to a temperature drop. The magnitude of the positive heat of solution determines how much cooling will occur when a solute is dissolved in a solvent.

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