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Delta H(1)^(@) for CO(2)(g), CO(g) and H...

`Delta H_(1)^(@)` for `CO_(2)(g)`, `CO(g)` and `H_(2)O(g)` are `-393.5,-110.5` and `-241.8 kJ mol^(-1)` respectively. Standard enthalpy change for the reaction
`CO_(2)(g)+H_(2)(g) rarr CO(g) + H_(2)O(g)` is

A

`524.1`

B

`+41.2`

C

`-262.5`

D

`-41.2`

Text Solution

Verified by Experts

`CO_(2)(g)+H_(2)(g) rarr CO(g) +H_(2)O(g)`
`DeltaH^(Theta) = {[Delta_(f)H^(Theta) CO, (g)+Delta_(f)H^(Theta)H_(2)O,(g)] -Delta_(f)H^(Theta)CO_(2),(g)}`
`= [(-110.5)+(-241.8(-(-393.5+0))]`
`= +41.2 kJ`
`Delta_(f)H^(Theta) H_(2),(g) = 0`
`Delta_(f)H^(Theta) = 0` in elementary state
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