$ \Delta H=-395.3,kJ/mole $
$ C_{gr}+O_2\to CO_2;,\Delta H=-393.4,kJ/mole $
$ C_{gr}\to {C_{dia}};,\Delta H= $ [BHU 2003]
A) - 3.8
B) - 1.9
C) + 3.8
D) + 1.9
Correct Answer: D
By (ii) - (i), $ C_{gr}\to C_{dia},,\Delta H=+1.9 $ .
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