? asked in Science & MathematicsChemistry · 1 month ago

What is the heat of reaction (ΔH°rxn) for the combustion of acetone (C3H6O) given the following thermochemical equations?

1. 3 C(s) + 3 H2(g) + ½ O2(g) → C3H6O(ℓ) ΔHf° = −285.0 kJ

2. C(s) + O2(g) → CO2(g) ΔHf° = −394.0 kJ

3. H2(g) + ½ O2(g) → H2O(ℓ) ΔHf° = −286.0 kJ

1 Answer

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  • 1 month ago

    The combustion reaction being asked about is:

    C3H6O + 4 O2 → 3 CO2 + 3 H2O(ℓ)

    products - reactants:

    (3 * (−394.0 kJ)) + (3 * (−286.0 kJ)) − (−285.0 kJ) − (4 * 0 kJ) = −1755 kJ

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