Predict the sign of ΔS for each of the following systems,which occur at constant temperature. I.The volume of 2.0 moles of Ne(g) increases from 54 L to 62 L.
II.The pressure of 2.0 moles of Ne(g) increases from 0.90 atm to 1.0 atm.

Question

Quizplus · Accepted Answer

For system I, the volume increases which means there is more freedom for the gas particles to move around. This results in an increase in entropy, so ΔS is positive. 
For system II, the pressure increases which means the gas particles are more confined and have less freedom to move around. This results in a decrease in entropy, so ΔS is negative.

Predict the Sign of ΔS for Each of the Following