Question

For reversible process, the value of $\Delta S$ is gives by the expression:

• A. ${{q}_{(rev)}}\times T$
• B. ${{q}_{(rev)}}\div T$
• C. $\Delta H/\Delta T$
• D. $T\div {{q}_{(rev)}}$

Answer 1

Answer: (B)

${{q}_{(rev)}}\div T$

Answer 2

Entropy (S) is the measurement of disorder of the molecules or randomness. It is an extension property & is a stable function. The change in entropy during a process is mathematically given as: $\Delta_{ r } S ^{0}=\sum S ^{0}($ products $)-\sum S ^{0}($ reactants $)$ $=\frac{ q _{ rev }}{ T }=\frac{\Delta H }{ T }$ $\therefore$ For reversible process, $\Delta S=\frac{q_{r e v}}{T}$