oxygen gas → elemental form
ΔH˚f and ΔG˚f for elements in their standard state are 0.
ΔS° for gas is greater than 0.
Which of the following is true for pure oxygen gas, O2(g) at 25°C?
A) ΔH°f > 0
B) ΔH°f < 0
C) ΔG°f > 0
D) ΔG°f < 0
E) ΔS° > 0
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