Heat of formation, `Delta H_(f)^(@)` of an explosive compound like `NCl_(3)` is -

The heat of formation (DeltaH_(f)^(@)) of H_(2)O(l) is equal to :

The enthalpy of formation (Delta H_(f)) of a compound from its elements is

Given: NH_(3)(g)+3Cl_(2)(g)toNCl_(3) (g)+3HCl(g),-DeltaH_(1) N_(2)(g)+3H_(2)(g)to2NH_(3)(g),DeltaH_(2) H_(2)(g)+Cl_(2)(g)to2HCl(g),DeltaH_(3) Heat of formation (DeltaH_(f)) of NCl_(3) in terms of DeltaH_(1), DeltaH_(2) and DeltaH_(3) is-

The standard heat of formation (Delta_(f)H_(298)^(@)) of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286" kJ/mol" ,respectively is

NCl_3 is a stable compound.

The standard heat of formation (Delta_(f)H_(298)^(0)) of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286kJ/mol , respectively is _______.

The standard heat of formation (Delta_(f)H_(298)^(0)) of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286kJ/mol , respectively is _______.