\[C\](diamond) \[+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-395\] kJ \[C\] (graphite) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-393.5\] kJ From the data, the \[\Delta H\] when diamond is formed from graphite, is [CBSE PMT 1989; BHU 1987]

\[C\](diamond) \[+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-395\] kJ �

1.	\[C\](diamond) \[+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-395\] kJ \[C\] (graphite) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-393.5\] kJ From the data, the \[\Delta H\] when diamond is formed from graphite, is [CBSE PMT 1989; BHU 1987]
A.	\[-1.5\,kJ\]
B.	\[+\,1.5\,kJ\]
C.	\[+\,3.0\,kJ\]
D.	\[-3.0\,kJ\]
Answer» C. \[+\,3.0\,kJ\]

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\[C\](diamond) \[+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-395\] kJ \[C\] (graphite) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-393.5\] kJ From the data, the \[\Delta H\] when diamond is formed from graphite, is [CBSE PMT 1989; BHU 1987]

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