The standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol- are -394,…

Chemistry JAMB 1993

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)?

  • -42 KJ mol- checkmark
  • +42 KJ mol-
  • -262 KJ mol-
  • +262 KJ mol-

The correct answer is: A

Explanation

Standard enthalpy change of a process = ∆H° process = ∆H° F reactant - DF° products
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