The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = - 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = - 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?
Correct answer: A. -109.5
- A. -109.5
- B. +109.5
- C. +180
- D. +100
Explanation
By Hess’s law, formation of CO can be obtained by subtracting CO combustion from carbon combustion: −394 − (−284.5) = −109.5 kJ/kg-mole. Therefore, the heat of formation is option a.
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