Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed? A) .$\Delta$H_soln 0, entropy of system decreases B) .$\Delta$H_soln $\approx$ 0, entropy of system decreases C) .$\Delta$H_soln $\approx$ 0, entropy change of system $\approx$ 0 D) .$\Delta$H_soln $\approx$ 0, entropy of system increases E) none of the above

Question

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed? A) .$\Delta$H_soln > 0, entropy of system decreases B) .$\Delta$H_soln $\approx$ 0, entropy of system decreases C) .$\Delta$H_soln $\approx$ 0, entropy change of system $\approx$ 0 D) .$\Delta$H_soln $\approx$ 0, entropy of system increases E) none of the above

Quizplus · Accepted Answer

When two completely miscible liquids are mixed, the resulting solution usually has a higher entropy than the separated liquids due to the increased freedom of movement of the particles. Choice D states that the enthalpy change (heat of mixing) is negative (exothermic) and the entropy change of the system is positive (increase in entropy), which is consistent with the mixing of two liquids that are completely miscible. The other choices either have incorrect entropy or enthalpy changes.

Which of the Following Sets of Conditions Could Exist When Δ\DeltaΔ

Which of the Following Sets of Conditions Could Exist When $\Delta$