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The difference between DeltaH and DeltaE...

The difference between `DeltaH` and `DeltaE` (on a molar basis) for the combustion of n-octane `(l)` at `25^(@)C` would be:

A

`-13.6KJ`

B

`1.14KJ`

C

`-11.15KJ`

D

`+11.15KJ`

Text Solution

Verified by Experts

The correct Answer is:
D
`C_(8)H_(18)(l)+(25)/(2)O_(2)(g)rarr8CO_(2)(g)+9H_(2)O(l)`
`Deltan_(g)=8-(25)/(2)=(16-25)/(2)=-4.5`
`DeltaH-DeltaE=Deltan_(g)RT=-(4.5xx8.314xx298)/(1000)=-11.15KJ`
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