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Delta(r)U^(@) of formation of CH(4) (g)...

`Delta_(r)U^(@)` of formation of `CH_(4)` (g) at certain temperature is - 393 kJ `mol^(-1)` .The value of `Delta_(r)H^(@)` is

A

zero

B

`ltDelta_(r)U^(@)`

C

`gtDelta_(r)U^(@)`

D

equal to `Delta_(r)U^(@)`

Text Solution

Verified by Experts

The correct Answer is:
2
`C+2H_(2)rarrCH_(4)`
(s),(g),(g)
`Deltan_(g)=-1`
`DeltaH=DeltaU+Deltan_(g)RT`
`Deltan_(g)=-ve`
`DeltaHltDeltaU`
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