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)?
-
A.
-42 KJ mol– -
B.
+42 KJ mol– -
C.
-262 KJ mol– -
D.
+262 KJ mol–
Correct Answer: Option A
Explanation
Standard enthalpy change of a process = ∆H° process = ∆H° F reactant – DF° products