Chemical Thermodynamics Question 320

Question: The enthalpies of combustion of carbon and carbon monoxide are -390 kJ and -278 kJ respectively. The enthalpy of formation of CO in kJ is

Options:

A) 668

B) 112

C) -112

D) -668

Show Answer

Answer:

Correct Answer: C

Solution:

  • C+O2CO2;ΔH=290kJ (1) CO+12O2CO2;ΔH=278,kJ (2) By eq. (1) and eq. (2), we get C+12O2CO;ΔH=112,kJ


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