Chemistry Practice Problems Entropy Practice Problems Solution: Which of the following result(s) in an increase in...

Solution: Which of the following result(s) in an increase in the entropy of the system?I. condensation of a gas to a liquidII. decreasing the volume of 1.0 mol of an ideal gas at constant temperatureIII. dissolving sugar in waterIV. heating 1.0 mol of an ideal gas at constant volume

Problem

Which of the following result(s) in an increase in the entropy of the system?

I. condensation of a gas to a liquid

II. decreasing the volume of 1.0 mol of an ideal gas at constant temperature

III. dissolving sugar in water

IV. heating 1.0 mol of an ideal gas at constant volume

Solution

We’re being asked to which of the following result(s) in an increase in the entropy of the system.


Recall that entropy is the degree of chaos or disorder of a system and that it depends on the following:


1. Phase: The gas phase has the highest entropy, followed by the liquid, and then the solid phase with the lowest entropy.

Gas > Liquid > Solid


2. Complexity: More elements in the compound leads to higher entropy.

Ex. NO3(g) [4 elements] has higher entropy than NO2(g) [3 elements].


3. Mass: The greater the mass, then the greater the entropy.

Ex. Xe(g) [greater mass] has higher entropy than He(g).


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