The `DeltaH_(f)^(@)` for `CO_(2)(g)`, CO(g) and `H_(2)O(g)` are `-395.5,-110.5` and `-241.8" kJ" mol^(-1)` respectively. The standard enthalpy change in (in kJ) for the reaction
`CO_(2)(g)+H_(2)(g)toCO(g)+H_(2)O(g)` is

Options

A. 524.1
B. 41.2
C. `-262.2`
D. `-41.2`

Answer

B

Explanation

`DeltaH=Sigma[DeltaH_(f)^(@)"products"]-Sigma[DeltaH_(f)^(@)"reactants"]`
`DeltaH^(@)-[DeltaH_(f)^(@)(CO(g))+DeltaH_(f)^(@)(H_(2)O(g))]^(-)`
`[DeltaH_(f)^(W)(CO_(2))(g)+DeltaH_(f)^(@)(H_(2))(g)]`
`=[-110.5+(-241.8]-[-393.5+0]=41.2`