Question

What will be the enthalpy change of conversion of graphite into diamond?

Given:, $C_{graphite,}\Delta_{comb}H = - 391.25kJ;$

$C_{diamond,}\Delta_{comb}H = - 393.12kJ$

• A. Zero
• B. $- 391.25kJ$
• C. $- 393.12kJ$
• D. $- 1.87kJ$

Answer 1

Answer: (D)

$- 1.87kJ$

Answer 2

: $C_{graphite} \rightarrow C_{diamond}$

$\Delta H_{combustion} - 391.25kJ, - 393.12kJ$

$\Delta H = - 393.12 - ( - 391.25) = - 1.87kJ$