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Example Question - 6

AQA AS-level ChemistryEnergeticsLesson 24 of 24

Hydrogen and chlorine react as shown. Use the data to calculate the mean bond enthalpy of the H-Cl bond.

H2(g) + Cl2(g) → 2HCl(g)   ΔH = -184 kJ mol-1

Bond enthalpies: H-H = 436 kJ mol-1, Cl-Cl = 243 kJ mol-1.

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