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Question

For the following reaction,
C (diamond) +O2CO2(g);ΔH=94.3kcal

C (graphite) +O2CO2(g);ΔH=97.6kcal
The heat required to change 1 g of C (diamond) C (graphite) 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 keal
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Solution

The correct option is D 0.275 keal
There are two reactions can be added together.

C(diamond)+O2CO2ΔH=94.3kcal

C(graphite)+O2CO2ΔH=97.6kcal

CO2C(graphite)+O2ΔH=+97.6kcal

on adding both reactions:

C(diamond)+O2+CO2C(graphite)+O2+CO2 ΔH=94.3+(+97.6)=3.3Kcal

ΔH for 1gC=112×3.3=0.275kcal


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