Question

The heat change at constant volume $(Q_V)$ is equal to

• A. $\Delta E$
• B. $\Delta H$
• C. $RT$
• D. $\Delta G$

Answer 1

Answer: (A)

From first law of thermodynamics,
$\Delta E=Q+W$ or $\Delta E=Q+p\Delta W$
At constant volume, $\Delta V=0$
$\therefore p\Delta V=0$ or $\Delta E=Q_V$