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Q.

What is the heat of formation of C6H6 , given that the heats of combustion of benzene, carbon and hydrogen are 782, 94 and 68K. Cal respectively.

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a

+14KCal

b

-14KCal

c

+28KCal

d

-28kCal

answer is A.

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Detailed Solution

C6H6+O2+3H2O;∆H1=782k.Cal

C+O2→CO2;∆H2=94k.Cal

6CO2=6X94=564

3H2O=3X68=204

6CO2+3H2O=564+204=768

∆H=782-768=14k.Cal

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What is the heat of formation of C6H6 , given that the heats of combustion of benzene, carbon and hydrogen are 782, 94 and 68K. Cal respectively.