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