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CO g H2 O g CO2 g H2 g Calculate the standard h... - JAMB Chemistry 2012 Question

CO(g) + H2 O(g) → CO2(g) + H2(g)
Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO2(g), H2O(g) and CO(g) and CO(g) in KJ mol -1 are - 394 -242 and - 110 respectively.
A
+ 262 KJ mol -1
B
- 262 KJ mol -1
C
+ 42 KJ mol -1
D
- 42 KJ mol -1
correct option: c
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