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CO(g) + H2O(g) → CO2(g) + H2(g) From the reaction above, calculate the standard enthalpies...

Chemistry
JAMB 2003

CO(g) + H2O(g) → CO2(g) + H2(g)
From the reaction above, calculate the standard enthalpies of formation if 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 Answer: Option B
Explanation

CO + H2O → CO2 + H2     DH = - 394 kJ mol-1

The equation for the standard enthalpy change of formation is

ΔHreaction = ΔH(products) − ΔH(reactants)

    = - 394 - ( - 242 - 110)
    = - 394 - ( - 352)
    = - 394 + 352
    = - 42 kJ mol-1


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