Question

If a reaction involves only solids and liquids which of the following is true?

• A. $\Delta H<\Delta E$
• B. $\Delta H=\Delta E$
• C. $\Delta H>\Delta E$
• D. $\Delta H=\Delta E+RT\Delta n$

Answer 1

Answer: (B)

$\Delta H=\Delta E+P\Delta V$, for solid and liquid,
$\Delta V=0$ or $\Delta H=\Delta E+\Delta nRT$, for solids and liquids $\Delta n=0$.