Question

What is the enthalpy change accompanying the conversion of graphite into diamond ? Heats of combustion of $C _{\text {(graphite)}}$ and $C _{\text {(diamond)}}$ are $-94.05$ and $-94.50\, kcal$ respectively

• A. $-188.55\, kcal$
• B. zero
• C. $0.45\, kcal$
• D. $-94.05\, kcal$

Answer 1

Answer: (C)

$\Delta H_{\text {reaction}}=-94.05-(-94.50)=+0.45$ kcal