The ionization enthalpy of `Na^(+)` formation from `Na_((g))` is `495.8kJmol^(-1)`, while the electron gain enthalpy of `Br` is `-325.0kJmol^(-1)`. Given the lattice enthalpy of `NaBr` is `-728.4kJmol^(-1)`. The energy for the formation of `NaBr` ionic solid is `(-)` ____ `times10^(-1) kJmol^(-1)`

Ionisation of energy F^(ɵ) is 320 kJ mol^(-1) . The electronic gain enthalpy of fluorine would be

For an exothermic reaction ArarrB , the activation energy is 65kJmol^(-1) and enthalpy of reaction is 42kJmol^(-1) . The activation energy for the reaction BrarrA will be:

The first ionisation potential of Na is 5.1eV . The value of electron gain enthalpy of Na^(+) will be

The ionisation enthalpy of hydrogen atom is 1.312 xx 10^6" J mol"^(-1) . The energy required to excite the electron in the atom from n = 1 to n = 2 is

Use the following data to calculate Delta_("lattice") H^(Θ) " for " NaBr. Delta_("Sub")H^(Θ) for sodium metal = 108.4 kJ mol^(-1) , ionisation enthalpy of sodium = 496 kJ mol^(-1) , electron gain enthalpy of bromine = -325 kJ mol^(-1) , bond dissociation enthalpy of bromine = 192 kJ mol^(-1), Delta_(f) H^(Θ) " for " NaBr(s) = - 360.1 kJ mol^(-1)

Bond dissociation enthalpies of H_(2(g)) and N_(2(g)) are "426.0 kJ mol"^(-1) and "941.8 kJ mol"^(-1) , respectively, and enthalpy of formation of NH_(3(g))" is "-"46 kJ mol"^(-1) . What are the enthalpy of atomisation of NH_(3(g)) and the average bond enthalpy of N-H bond respectively ( in kJ "mol"^(-1) )?

The standard enthalpy of formation of NH3 is -46.0 kJ mol^(-1) . If the enthalpy of formation of H_2 from its atoms is -436 kJ mol and that of N_2 is -712 kJ mol, the average bond enthalpy of N - H bond in NH_3 is

Bond dissociation enthalpy of H_(2) , Cl_(2) and HCl are 434, 242 and 431KJmol^(-1) respectively. Enthalpy of formation of HCl is

If the ionization enthalpy and electron gain enthalpy of an element are 275 and 86 kcal mol^(-1) respectively, then the electronegativity of the element on the Pauling scale is

The enthalpy of formation of UF(g) is 22kcal mol^(-1) and that of U(g) is 128kcal mol^(-1) . The bond energy of the F-F bond is 37kcal mol^(-1) . The bond dissociation energy of UF(g) is (are):