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DeltaU^@ of combustion of methane is -X ...

`DeltaU^@` of combustion of methane is `-X kJ mol^(-1)`. The value of `DeltaH^@` is

A

`=DeltaU^(Theta)`

B

`gt DeltaU^(Theta)`

C

`lt DeltaU^(Theta)`

D

`=0`

Text Solution

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(iii) `CH_(4) (g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(g)`
`Deltan_(g) = (n_(p)-n_(r)) = 1-3=2`
`DeltaH^(@) = -X - 2RT`
`DeltaH^(@) lt DeltaU^(@)`, hence option (iii) is correct.
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