Chemistry
NULL
Medium
Question
A reaction has values of ΔH and ΔS which are both positive. The reaction __________________?
A
Is spontaneous
B
Spontaneity is temperature dependent
C
Has an increasing free energy
D
Is non-spontaneous
✓ Official correct answer
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A
Is spontaneous
No member explanations yet for this option.
B
Spontaneity is temperature dependent
No member explanations yet for this option.
C
Has an increasing free energy
No member explanations yet for this option.
D
Is non-spontaneous
No member explanations yet for this option.
Explanation
Since Gibbs free energy is given by ΔG = ΔH - TΔS, when both ΔH and ΔS are positive, the spontaneity of the reaction depends on temperature — it becomes spontaneous only when the temperature is high enough for the TΔS term to outweigh ΔH.
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