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DeltaH(t)^(@) for CO(2)(g) and H(2)O(g) ...

`DeltaH_(t)^(@)` for `CO_(2)(g)` and `H_(2)O(g)` are `-393.5, -110.5` and `-241.8 kJ"mol"^(-1)` respectively. The standard enthalpy change (in kJ) for the reaction.
`CO_(2)(g) + H_(2)(g) to CO(g) + H_(2)O(g)` is:

A

524.1

B

41.2

C

– 262.5

D

– 41.2

Text Solution

Verified by Experts

The correct Answer is:
B
`CO_2(g) + H_2(g) to CO(g) + H_2O (g)`
`Delta_r H^@ = Delta_f H_(CO)^@ + Delta_f H_(H_2O)^@ - Delta_fH_(CO_2)^@ - Delta_f H_(H_2)^@`
` = - 110.5 + (-241.8)-(-393.5)-0`
`=41.2kJ//"mole"`.
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