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Question 17

From Chemistry HL Paper 1 (May 2024, TZ2)

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  1. Standard enthalpy changes of reaction are provided for the following reactions.
    C(s) + O2(g) → CO2(g) ΔHθ = −394 kJ
    H2(g) + 1/2 O2(g) → H2O(l) ΔHθ = −286 kJ
    C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) ΔHθ = −1367 kJ
    What is the standard enthalpy change, in kJ, of the following reaction?
    2C(s) + 3H2(g) + 1/2 O2(g) → C2H5OH(l)