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The standard enthalpy of formation of NH3 is –46.0 kJ mol–1. If the enthalpy of formation of H2 from its atoms is –436 kJ mol–1 and that of N2 is –712 kJ mol–1, the average bond enthalpy of N — H bond is NH3 is

–1102 kJ mol–1
–964 kJ mol–1
+352 kJ mol–1
+1056 kJ mol–1
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