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 $\Delta E=q+p\Delta V$ At constant volume, $\Delta V=0$ $\therefore$ $p\Delta V=0$ or $\Delta E=q_v$