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Question

Determine the heat of transformation of C(diamond)→ C(graphite) from the following data.

C(diamond)+O2(g)CO2(g) H=94.5Kcal

C(graphite)+O2(g)CO2(g) H=94.0Kcal

A

-0.5 K cal

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B

0.5 K cal

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C

188.5 K cal

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D

-188.5 K cal

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Solution

The correct option is A

-0.5 K cal


The equations given to us are as follows:

C(diamond)+O2(g)CO2(g) H=94.5 K cal(i)
C(graphite)+O2(g)CO2(g) H=94.0 K cal(ii)
Now we subtract equation (ii) from (i) we get

C(diamond)C(graphite) H=0.5 K cal

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