Question

One mole of solute AB dissolved in 20 moles of water
absorbed 13.6kJ of heat. When one mole of same solute
dissolved in 200 moles of water 16.6 kJ of heat is absorbed.
Calculate the enthalpy of dilution
(A) 2.68 kJ
(B) 3 kJ
(C) 3.8 kJ
(D) 4.6 kJ​

Answer 1

Answer:

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Answer 2

Given:

ΔH when one mole of solute AB is dissolved in 20 moles of water = +13.6 kJ

ΔH when one mole of AB is dissolved in 200 moles of water = +16.6 kJ

To find:

Enthalpy of dilution.

Solution:

The enthalpy of dilution is the change in enthalpy when one mole of solute is dissolved in solvent for two different concentrations.

Therefore ΔH of dilution = 16.6 - 13.6 kJ = 3 kJ

Therefore the enthalpy of dilution is 3 kJ (Option B).