A step used in an enthalpy calculation is written as 2NO(g) + O₂(g) → 2NO₂(g) ΔH =…

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

Problem

A step used in an enthalpy calculation is written as 2NO(g) + O₂(g) → 2NO₂(g)  ΔH = –114 kJ A student needs the reverse of half of this reaction for a Hess’s-law pathway. What ΔH value should the student use? (a) +114 kJ+114\ \text{kJ} (b) +28.5 kJ+28.5\ \text{kJ} (c) +57 kJ+57\ \text{kJ} (d) −57 kJ-57\ \text{kJ}

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