Enthalpy of atomization of `C_(2)H_(6)(g) and C_(3)H_(8)(g)` are 620 and `880kJmol^(-1)` respectively. The C-C and C-H bond energies are respectively

If enthalpy of dissociation of CH_(4) and C_(2)H_(6) are 320 and 360 calories respectively then bond energy of C-C bond is:

If enthalpy of dissociation of CH_(4) and C_(2)H_(6) are 320 and 360 calories respectively then bond energy of C-C bond is:

The molar enthalpies of combustion of C_(2)H_(2)(g), C("graphite") and H_(2)(g) are -1300,-394 , and -286 kJ mol^(-1) , respectively. The standard enthalpy of formation of C_(2)H_(2)(g) is

The molar enthalpies of combustion of C_(2)H_(2)(g), C("graphite") and H_(2)(g) are -1300,-394 , and -286 kJ mol^(-1) , respectively. The standard enthalpy of formation of C_(2)H_(2)(g) is

The enthalpies of formation of C_2H_2(g) and C_6H_6(g) at 298 K are 230 and 85 kJ/mol respectively. The enthalpy change for the reaction 3C_2H_2(g) to C_6H_6(g) is

The dissociation energy of CH_(4) and C_(2)H_(6) are respectively 1508 and 2594 kJ mol^(-1) respectively. The bond energy of C-C bond is

The enthalpies of combustion of C_(2)H_(2)(g) and C(2)H_(6)(g) are -1301 kJ and -1561.5 kJ respectively. The enthalpy of formation of liquid water is -286 kJ. Calculate the enthalpy change for the reaction : C_(2)H_(2)(g) + 2H_(2)(g) to C_(2)H_(2)(g) .

If enthalpies of formation of C_(2)H_(4)(g)1 ,CO_(2) and H_(2)O(l) at 25(@)C and 1 atm pressure be 52,-394 and -286kJmol^(-1) respectively ,the enthalpy of combustion of C_(2)H_(4)(g) will be