alleryStart learning →When the entropy change of the universe is zero, the system is:
AWholly forbidden
BPerfectly crystalline
CAt equilibrium
DFully spontaneous
Answer & Solution
Correct answer: C. At equilibrium
1. The sign of the universe's entropy change classifies the process.
2. Spontaneous change increases the entropy of the universe.
3. In one case the entropy change of the universe is zero.
4. In that case the system is at equilibrium.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 16 'Thermodynamics', sections 16.1-16.4_
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