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DeltaU^(@) of combustion of CH(4(g)) at ...

`DeltaU^(@)` of combustion of `CH_(4(g))` at certain temperature is `-"393 kJ mol"^(-1)`. The value of `DeltaH^(@)` is

A

zero

B

`lt DeltaH^(@)`

C

`gt DeltaU^(@)`

D

equal to `DeltaU^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
The balanced equation for combustion of methane is
`CH_(4(G))+2O_(2(g))rarrCO_(2(g))+2H_(2)O_((l))`
Here, `Deltan_(g)=1-3=-2`
`DeltaH^(@)=DeltaU^(@_+Deltan_(g)RT`
`DeltaH^(@)=-393-2RT`
`therefore" "DeltaH^(@) lt DeltaU^(@)`
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