Question on: JAMB Chemistry - 2003
CO(g) + H2O(g) → CO2(g) + H2(g)
From the reaction above, calculate the standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol-1 are -394, -242, and -110 respectively.
A
-262 kJ mol-1
B
-42 kJ mol-1
C
+42 kJ mol-1
D
+262 kJ mol-1
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Correct Option: B
CO + H2O → CO2 + H2 DH = 394 kJ mol-1
-242 + 110 = -352 kJ mol-1
35 = -394 -(352)
= -394 + 352
= -42 kJ mol-1
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