A sample of 1 mol of gas initially at 1 atm and 298 k is heated atconstant press

Question

A sample of 1 mol of gas initially at 1 atm and 298 k is heated atconstant pressure to 350 K, then the gas is compressed isothermallyto its initial volume and finaly it is cooled to 298 K at constantvolume. Which of the following values is zero?

a.) Change in entropy (surrounding) and change in Gibbs freeenergy
b.) Change in entropy (system) and change in entropy(surrounding)
c.) q and w
d.) W
e.) Change in Gibbs free energy and change in entropy (system)

Explanation / Answer

"the gas is compressed isothermally to its initialvolume" ... "and then cooled to 298K" 298 is the original temperature => P = P(V,T).  Return to original pressure also. You return to the original state, so state functions (gibbs freeenergy and entropy are zero) Answers, a, b, and e are 0

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