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Carbon reacts with oxygen to produce carbon dioxide (CO2 (g), mc011-1.jpgHf = –393.5 kJ/mol) according to the equation below. mc011-2.jpg What is the enthalpy change of the reaction?

Respuesta :

BlueSky06
The reaction is presented by
C + O2 ==> CO2
The enthalpy of formation of CO2 is –393.5 kJ/mol

We are asked for the enthalpy change of the reaction
Hr = Hf CO2 - (Hf C + Hf O2)
Since C and O2 are elements, their enthalpies of formation is 0
So,
Hr = -393.5 - 0
Hr = –393.5 kJ/mol