1.

Calculate the standard N- H bond enthalpy from the following data : `N_(2(g)) + 2H_(2(g)) to 2NH_(3(g)) Delta H^(@) = - 83 kJ` `Delta H^(@) (N= N) = 946 kJ mol^(-1) , Delta H^(@) (H-H) 436 kJ mol^(-1)`

Answer» `Delta H_(N- H)^(@) = 389 kJ mol^(-1)`


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