1) The standard state (1 bar, 298 K) entropy of helium gas is S o =126 J K -1 mo

Question

1) The standard state (1 bar, 298 K) entropy of helium gas is So=126 J K-1 mol-1. Treat helium as an ideal gas with CVm =3R/2, and calculate delta G (in J) for the reversible expansion of 1.4 mole of helium gas at a constant absolute pressure of 1 bar from T = 298 K to T=355 K.

2) delta G for the constant pressure reversible process of the previous question is non zero because

The second law does not apply in this situation.

T is not constant.

delta G is only zero for changes in isolated systems.

I made an error in my calculation.

The second law does not apply in this situation.

T is not constant.

delta G is only zero for changes in isolated systems.

I made an error in my calculation.

Explanation / Answer

I think that A

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