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The enthalpy of reaction for the combustion of C to produce CO2(g) is -393.5 kJ/mol and the
enthalpy of the reaction of CO to produce CO2 is -283.0 kJ/mol as shown in the reactions:
(1) C(S) + O2(g) CO2(g) H=-393.5 kJ
(2) CO(g) + 1/2O2(g) CO2(g) H=-283.0 kJ
Based on these data, calculate the enthalpy of combustion of C to produce CO:
(3) C(S) + 1/2O2(g) CO(g) H=?

Respuesta :

okpalawalter8

The enthalpy of combustion of C to produce is mathematically given as

dHo rxn = -110.5 KJ

What is the enthalpy of combustion of C to produce?

Question Parameters:

the combustion of C to produce CO2(g) is -393.5 kJ/mol

the reaction of CO to produce CO2 is -283.0 kJ/mol

The Hess law

Hess's law states that during a chemical reaction any change in the enthalpy of a chemical reaction is identical nonetheless, not regarding if the reaction takes place in one step or several steps, so far we have similar final and the initial states.

Generally, the equation for the reaction 3  is mathematically given as

reaction 3 = +1 * (reaction 1) -1 * (reaction 2)

Therefore

dHo rxn = +1 * (-393.5) -1 * (-283.0)

dHo rxn = -110.5 KJ

In conclusion, the enthalpy of combustion is

dHo rxn = -110.5 KJ

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