Chemistry questions attached

Answer:
2.25 × 10³ kJ
Explanation:
You are given 2.81 moles of CH₄. You need to find out how much heat is generated when this much CH₄ is burned. The ΔH° of the reaction is -802 kJ/mol. Multiply ΔH° by moles of CH₄ to find the amount of heat generated.
2.81 mol × 802 kJ/mol = 2253.62 kJ ≈ 2.25 × 10³ kJ