Question

Which one of the following reactions would produce the largest amount of heat per mole of oxygen?

A) 2 Ca (s) + O₂ (g) → 2 CaO (s) ΔH° = -635 kJ/mol
B) CH₄ (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O(g) ΔH° = -802 kJ/mol
C) 2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g) ΔH° = -1280 kJ/mol
D) 2 Pb(s) + 3 O₂ (g) → 2 SO₂ (g) + 2 PbO (s) ΔH° = -828 kJ/mol

Answer 1

The reaction that would produce the largest amount of heat per mole of oxygen is option C) 2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g) with ΔH° = -1280 kJ/mol.

Step-by-step explanation:

The reaction that would produce the largest amount of heat per mole of oxygen is option C) 2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g) with ΔH° = -1280 kJ/mol.

This is because the enthalpy change (heat) for a reaction is directly proportional to the number of moles of the reactants. In this reaction, 2 moles of CH₃OH and 3 moles of O₂ react to form 2 moles of CO₂ and 4 moles of H₂O, resulting in a larger heat release compared to the other options.