The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ?H = 394 kJ/kg .mole CO + O2 = CO2, ?H = 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

A. 180

B. -109.5

C. 109.5

D. 100

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