The bond enthalpies of `H_(2) , X_(2)` and HX are in the ratio of `2 : 1 : 2` , if the enthalpy for formation of HX is `-50 kJ mol^(-1)` , the bond ethalpy of `H_(2)` is -

AB, A_2 and B_2 are diatomic molecules. If the bond enthalpies A_2 AB and B_2 are in the ratio 1:1:0.5 and the enthalpy of formation of AB fron A_2 and B_2 is -100 kJ mol^-1 , what is the bond enthalpy of A_2 :

AB,A_(2) and B_(2) are diatomic molecules. If the bond enthalpies of A_(2), AB and B_(2) are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A_(2) and B_(2) is -100kJ mol^(-1) , what is the bond enthalpy of A_(2) ?

AB,A_(2) and B_(2) are diatomic molecules. If the bond enthalpies of A_(2), AB and B_(2) are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A_(2) and B_(2) is -100kJ mol^(-1) , what is the bond enthalpy of A_(2) ?

AB,A_(2) and B_(2) are diatomic molecules. If the bond enthalpies of A_(2), AB and B_(2) are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A_(2) and B_(2) is -100kJ mol^(-1) , what is the bond enthalpy of A_(2) ?

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

The standard enthalpy of formation of NH_(3) is -46.0 kJ mol^(-1) . If the enthalpy of formation of H_(2) from its atoms is -436 kJ mol^(-1) and that of N_(2) is -7112kJ mol^(-1) , the average bond enthalpy of N-H bond in NH_(3) is :-