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For the reaction C(3)H(8)(g)+5O(2)rarr...

For the reaction
`C_(3)H_(8)(g)+5O_(2)rarr3CO_(3)(g)+4H_(2)O(l)`
at constant temperature, `DeltaH-DeltaU` is

A

`+ RT`

B

`- 3 RT`

C

`+ 3 RT`

D

`- RT`

Text Solution

Verified by Experts

The correct Answer is:
B
Accroding to thermodynamics,
`Delta H = Delta U + Delta n_(g) RT`
or `Delta H - Delta U = Delta n_(g) RT`
where `Delta n_(g) = sum n_(P) (g) - sum n_(R ) (g)`
`= (3) - (1 + 5)`
`= - 3`
`:. Delta H - Delta U = - 3 RT`
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