In which state would one mole of neg have the highest

12. In which state would one mole of Ne(g) have the highest
entropy?
a) at 27°C in a volume of 25 L
b) at 137°C in a volume of 25 L
c) at 27°C in a volume of 35 L
d) at 137°C in a volume of 35 L
e) Ne has the same entropy in all four of these states.

2
13. Which of the following statements must be true for the
entropy of a pure solid to be zero?
I. The temperature must be 0 K.
II. The solid must be crystalline, not amorphous.
III. The solid must be perfectly ordered.
IV. The solid must be an element.
14. Consider the following thermochemical equation:
Mg(s) + Cl
2
(g) → MgCl
2
(s) ∆ H° = –641.6 kJ
When is this reaction spontaneous?
15. Use the thermodynamic data below to determine the
standard free energy change, ∆ G°, for the following
reaction at 25°C.
4Al(s) + 3 O
2
(g) → 2Al
2
O
3
(s) ∆ H° = -3352 kJ
The standard molar entropies of these substances are as
follows:
Al(s) S° = 28.3 J/mol
.
K
O
2
(g) S° = 205.0 J/mol
.
K
Al
2
O
3
(s) S° = 50.9 J/mol
.
K