1.

The standard enthalpy of formation of NH_(3) is -46.0kJmol^(-1). If enthalpy of formation of H_(2) from its atoms is 436 kJ mol^(-1) and that of N_(2) is -712kJmol^(-1), the average bond enthalpy of N-H bond in NH_(3) is

Answer»

`-964kJmol^(-1)`
`+352kJmol^(-1)`
`+1056kJmol^(-1)`
`-1102kJmol^(-1)`

ANSWER :B


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