Given,
`H_(2)(g)+Br_(2)(g)to2HBr(g),DeltaH_(1)^(@)`
and standard enthalpy of condensation of bromine is `DeltaH_(2)^(@)`, standard enthalpy of formation of HBr at `25^(@)` C is :

Given, H_(2)(g)+Br_(2)(g)rarr2HBr(g),DeltaH_(1)^(0) and standard enthalpy of condensaion of bromine is DeltaH_(2)^(0) , standard enthalpy of formation of HBr at 25^(@)C is

Given, H_(2)(g)+Br_(2)(g)rarr2HBr(g),DeltaH_(1)^(0) and standard enthalpy of condensaion of bromine is DeltaH_(2)^(0) , standard enthalpy of formation of HBr at 25^(@)C is

Given, H_(2)(2)+Br_(2)(g)rarr2HBr(g) , Deltah_(1)^(@) and standerd enthalpy of condensation of bromine is DeltaH_(2)^(@) , standard enthalpy of formation of HBr at 25^(@)C is

Given N_(2)(g)+3H(g)=2NH_(3)(g),DeltaH^(@)=22 kcal. The standard enthalpy of formation of NH_(3) gas is

Given that (1)/(2)S_(8)(s)+6O_(2)(g)to4SO_(3)(g) , DeltaH^(@)=-1590 kJ The standard enthalpy of formation of SO_(3) is

The enthalpy change for the following process are listed below : (a) Cl_(2(g)) rarr 2Cl_((g)), DeltaH=242.3kJ mol^(-1) (b) I_(2(g))rarr 2I_((g)), DeltaH=151.0kJ mol^(-1) (c) ICl_((g)) rarr I_((g))+Cl_((g)), DeltaH=211.3kJ mol^(-1) (d) I_(2(s)) rarr I_(2(g)), DeltaH=62.76kJ mol^(-1) If standard state of iodine and chloride are I_(2(s)) and Cl_(2(g)) , the standard enthalpy of formation for ICl_((g)) is :

Between O_(2)(g) and O_(3)(g) , whose standard enthalpy of formation (DeltaH_(f)^(0)) is taken as zero at 1 atm and 25^(@)C ?