Question 1
If a reaction with a negative value of Δ
S is nonspontaneous at constant temperature and pressure,
◦ Δ
G is negative and Δ
H is positive.
◦ Δ
G is positive and Δ
H may be positive or negative.
◦ Δ
G is negative and Δ
H may be positive or negative.
◦ Δ
G is positive and Δ
H is positive.
Question 2
Consider the conversion of white tin to gray tin:
Sn(white) → Sn(gray) | ΔH° = -2.09 kJ | ΔS° = -7.41 J/K |
Based on these data,
◦ gray tin is stable below 15°C and white tin is stable above 15°C.
◦ white tin is stable below 15°C and gray tin is stable above 15°C.
◦ gray tin is stable below 9°C and white tin is stable above 9°C.
◦ white tin is stable below 9°C and gray tin is stable above 9°C.