If the enthalpy of formation of CO2(g) is -393.5 kJ/mol, what is the enthalpy ch

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Question: If the enthalpy of formation of CO2(g) is -393.5 kJ/mol, what is the enthalpy change for the combustion of 1 mole of carbon?

Options:

Correct Answer: -393.5 kJ

Solution:

The combustion of carbon to form CO2 releases -393.5 kJ, which is the enthalpy change for the reaction.

If the enthalpy of formation of CO2(g) is -393.5 kJ/mol, what is the enthalpy change for the combustion of 1 mole of carbon?

If the enthalpy of formation of CO2(g) is -393.5 kJ/mol, what is the enthalpy change for the combustion of 1 mole of carbon?

Step 1: Understand that the enthalpy of formation of CO2(g) is given as -393.5 kJ/mol. This means that when 1 mole of CO2 is formed from its elements, 393.5 kJ of energy is released.
Step 2: Recognize that the combustion of carbon (C) involves the reaction of carbon with oxygen (O2) to produce CO2.
Step 3: Realize that the enthalpy change for the combustion of carbon is the same as the enthalpy of formation of CO2, but with a negative sign because energy is released during combustion.
Step 4: Conclude that the enthalpy change for the combustion of 1 mole of carbon is -393.5 kJ.

Enthalpy of Formation – The enthalpy change associated with the formation of a compound from its elements in their standard states.
Combustion Reaction – A chemical reaction where a substance combines with oxygen, releasing energy in the form of heat and light.