What is the standard enthalpy change for the reaction: C(s) + O2(g) → CO2(g) if

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Question: What is the standard enthalpy change for the reaction: C(s) + O2(g) → CO2(g) if ΔHf° for CO2 is -393.5 kJ/mol?

Options:

Correct Answer: -393.5 kJ

Solution:

The standard enthalpy change is equal to the enthalpy of formation of CO2, which is -393.5 kJ.

What is the standard enthalpy change for the reaction: C(s) + O2(g) → CO2(g) if ΔHf° for CO2 is -393.5 kJ/mol?

What is the standard enthalpy change for the reaction: C(s) + O2(g) → CO2(g) if ΔHf° for CO2 is -393.5 kJ/mol?

Step 1: Understand that the reaction given is the formation of carbon dioxide (CO2) from carbon (C) and oxygen (O2).
Step 2: Recognize that the standard enthalpy change for a reaction can be found using the enthalpy of formation (ΔHf°) of the products.
Step 3: Note that the ΔHf° for CO2 is provided as -393.5 kJ/mol.
Step 4: Realize that since CO2 is the only product in this reaction, the standard enthalpy change for the reaction is equal to the ΔHf° of CO2.
Step 5: Conclude that the standard enthalpy change for the reaction C(s) + O2(g) → CO2(g) is -393.5 kJ.

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