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An endothermic process that involves an increase in system entropy is spontaneous when temperature is:
ABelow zero
BHigh enough
CExactly zero
DAlways fixed
Answer & Solution
Correct answer: B. High enough
1. Enthalpy and entropy pull in opposite directions here.
2. This condition describes an endothermic process that involves an increase in system entropy.
3. Both its enthalpy and entropy changes are positive, so they share an arithmetic sign.
4. A process with matching signs exhibits a temperature-dependent spontaneity.
5. Raising the temperature lets the entropy term dominate, so the process becomes spontaneous.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 16 'Thermodynamics', sections 16.1-16.4_
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