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The heat of combustion of carbon is -94 ...

The heat of combustion of carbon is -94 kcal at 1 atm pressure. The intrinsic energy of `CO_(2)` is

A

`+94` kcal

B

`-94` kcal

C

`+47` kcal

D

`-47` kcal

Text Solution

Verified by Experts

The correct Answer is:
B
`C(s) + O_(2)(g) rarr CO_(2)(g), Delta H= -94`K kcal
`Delta n_(g)= 1-1= 0`
`Delta H= Delta E + Delta n_(g) RT rARr Delta E= -94` kcal
`Delta E= E_(CO_(2)) - E_(C)- E_(O_(2))`
`-94 = E_(CO_(2)) - 0-0` [Internal energy of elements= 0]
`E_(CO_(2)) = -94` kcal
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