Given,
\[
\begin{array}{c}
C_{\text {diamond }}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ;...
Given,
\[
\begin{array}{c}
C_{\text {diamond }}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ; \Delta H=-395.3 \mathrm{~kJ} / \mathrm{mol} \\
C_{\text {graphite }}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ; \Delta H=-393.4 \mathrm{~kJ} / \mathrm{mol}
\end{array}
\]
The enthalpy change \( (\Delta H) \) for the reaction,
(a) \( +1.9 \)
\( C_{\text {graphite }} \longrightarrow C_{\text {diamond }} \) in \( \mathrm{kJ} / \mathrm{mol} \) is
(c) \( +3.8 \)
(b) \( -1.9 \)
(d) \( -3.8 \)
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