Which one of the following is the correct value for the enthalpy of formation of CO?
Correct answer: A. -110 kJ/mol
- A. -110 kJ/mol
- B. -210 kJ/mol
- C. -111 kJ/mol
- D. None of these options is correct
Explanation
By constructing a Hess' Cycle for CO along with the relevant data given relating to the standard enthalpy change of formation of CO2 and standard enthalpy change of combustion of CO, along with drawing relevant arrows, and then doing reactants - products, the answer comes as "-110 kJ/mol" approximately.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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