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In the reaction 2C + O2-> 2CO, if the heat liberated is 10 J, what is the heat of formation of CO?

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In the reaction 2C + O2-> 2CO, if the heat liberated is 10 J, what is the heat of formation of CO?

(a) -5 J

(b) 5 J

(c) -10 J

(d) 10 J

The question was posed to me in an interview for job.

This interesting question is from Standard Heat (Enthalpy) of Formation topic in chapter Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction of Basic Chemical Engineering

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Best answer
Right option is (a) -5 J

For explanation: Heat of formation = -10/2 = -5 J.

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