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The difference between heats of reaction...

The difference between heats of reaction at constant pressure and constant volume for the reaction.
`2C_(6)H_(6)(l) +15O_2(g) rarr 12CO_(2)(g) + 6H_(2)O(l)` at `25^(@)C` is :

A

`-7.43 kJ`

B

`+3.72 kJ`

C

`-3.72 kJ`

D

7.43 kJ

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta H = Delta U+Delta n_ (g)RT`
`Delta n_(g)=12-15= -13`
`:. Deltha H - Delta U= (-3) xx 8.314 xx 298`
= `-7.43 kJ`
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