Question 1
Which is the
lowest at 25°C?
◦ 1/2Δ
G°
f for O
2 (
g) plus Δ
G°
f for H
2O (
g)
◦ Δ
G°
f for H
2O (
l)
◦ Δ
G°
f for H
2O (
g)
◦ Δ
G°
f for H
2O (
s)
Question 2
A positive value of Δ
G°
f for a solid compound at 25°C means the
◦ compound must be a liquid or a gas at 25°C and 1 atm.
◦ process of forming the compound from the stable elements at 25°C and 1 atm is nonspontaneous.
◦ process of forming the compound from the elements is exothermic.
◦ compound cannot exist at 25°C and 1 atm.