For the following reaction : CDiamond+O2→CO2(g);ΔH=−94.3kcal CGraphite+O2→CO2(g);ΔH=−97.6kcal The heat required to change 1 g of Cdiamond→Cgraphite is:
A
1.59 kcal
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B
0.1375 kcal
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C
0.55 kcal
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D
0.275 kcal
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Solution
The correct option is A 0.275 kcal As given,
For the following reaction : CDiamond+O2→CO2(g);ΔH=−94.3kcal CGraphite+O2→CO2(g);ΔH=−97.6kcal Cdiamond→Cgraphite heat change = 3.3 kcal per mole
so for 1 gm of Cdiamond→Cgraphite heat change = 3.3/12 = 0.275 kcal