The standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol– are -394, -242 and -110 respectively. What is the standard enthalpy change for the reaction CO(g) + H2(g)O → CO2(g) + H2(g)?
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-42 KJ mol-
- +42 KJ mol-
- -262 KJ mol-
- +262 KJ mol-