The standard enthalpies of formation of CO_2(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) + H_2(g)O → CO_2(g) + H_2(g)?

-42 KJ mol^-

+42 KJ mol^-

-262 KJ mol^-

+262 KJ mol^-

Correct answer is A

Standard enthalpy change of a process = ∆H° process = ∆H° _F reactant - D_F° products

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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)?