Measured enthalpy changes (all at 298 K) are: 1
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
Measured enthalpy changes (all at 298 K) are:
1. Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g) ΔH₁ = −445.0 ± 1.5 kJ
2. MgO(s) + 2 HCl(aq) → MgCl₂(aq) + H₂O(l) ΔH₂ = −150.0 ± 1.2 kJ
3. H₂(g) + ½ O₂(g) → H₂O(l) ΔH₃ = −285.8 ± 0.4 kJ
Using these data, determine the minimum and maximum possible values (bounds) for ΔH of the reaction Mg(s) + ½ O₂(g) → MgO(s).
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