Enthalpy Change

Step 1: Understand the reaction. We are asked to calculate the enthalpy change for the reaction: Step 2: Use the enthalpy of formation values. The enthalpy change of a reaction can be calculated using the enthalpy of formation values: For this reaction: - The enthalpy of formation for and is 0. - The enthalpy of formation for is -285.8 kJ/mol. Substitute into the equation: Answer: Therefore, the enthalpy change for the reaction is .

Step 1: Understand the enthalpy change of the reaction The given enthalpy change for the reaction is , meaning that for each mole of carbon reacting with oxygen, of heat is released. Step 2: Calculate the heat released for 2 moles of carbon For 2 moles of carbon, the total heat released will be: Answer: Therefore, the heat released when 2 moles of carbon react with excess oxygen is . So, the correct answer is option (2).