What is the enthalpy change for the reaction: C(s) + O2(g) -> CO2(g)?
Practice Questions
Q1
What is the enthalpy change for the reaction: C(s) + O2(g) -> CO2(g)?
-393.5 kJ/mol
-241.8 kJ/mol
0 kJ/mol
285.8 kJ/mol
Questions & Step-by-Step Solutions
What is the enthalpy change for the reaction: C(s) + O2(g) -> CO2(g)?
Correct Answer: -393.5 kJ/mol
Step 1: Identify the reactants and products in the reaction. The reactants are carbon (C) and oxygen (O2), and the product is carbon dioxide (CO2).
Step 2: Understand that the enthalpy change (ΔH) measures the heat energy change during a chemical reaction.
Step 3: Recognize that the reaction is a formation reaction, where elements combine to form a compound.
Step 4: Look up the standard enthalpy of formation for CO2, which is the energy change when 1 mole of CO2 is formed from its elements in their standard states.
Step 5: Find that the standard enthalpy of formation for CO2 is -393.5 kJ/mol. This means that 393.5 kJ of energy is released when 1 mole of CO2 is formed from carbon and oxygen.
Step 6: Conclude that the enthalpy change for the reaction C(s) + O2(g) -> CO2(g) is -393.5 kJ/mol.
