Standard enthalpies of formation (in kJ mol⁻¹) at 298 K are given below

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Standard enthalpies of formation (in kJ mol⁻¹) at 298 K are given below. H₂O(l) −285.8 H₂(g) 0.0 O₂(g) 0.0 Which of the following values is closest to the standard enthalpy change for the reaction H₂(g) + ½ O₂(g) → H₂O(l) ? (a) −143 kJ mol−1-143\ \text{kJ mol}^{-1} (b) −286 kJ mol−1-286\ \text{kJ mol}^{-1} (c) +286 kJ mol−1+286\ \text{kJ mol}^{-1} (d) −572 kJ mol−1-572\ \text{kJ mol}^{-1}

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