A) \[+\,2.0\,kJ\]
B) \[-1.5\,kJ\]
C) \[-788\,kJ\]
D) \[788\,kJ\]
Correct Answer: A
Solution :
\[C(dimond)+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}};\,\,\,\Delta H =-395\,kJ\] ?(i) \[C(graphite)+{{O}_{2}}\xrightarrow{\,}C{{O}_{2}};\,\Delta H=-393\,kJ\] ?(ii) Eq. (i) - Eq. (ii), we get \[C(diamond)\xrightarrow{{}}C(graphite)\] \[\Delta H=[-395-(-393)]\,kJ=-2.0\,kJ\] and \[C(graphite)\xrightarrow{{}}C(diamond);\] \[\Delta H=+2.0\,kJ\]
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