The combustion enthalpies of carbon, hydrogen and ethyne are `-393.5 kJ mol^(-1), - 285.8 kJ mol^(-1)` and `-1309.5 kJ mol^(-1)` respectively at `25^(@)C`. The value of standard enthalpy of formation of acetylene at this temperature is

The combustion enthalpies of carbon, hydrogen and methane are -395.5 "kJ" mol^-1, -285.8 "kJ" mol^-1 "and" -890.4 kJ mol^-1 "respectively at " 25^@C . The value of standard formation enthalpy of methane at that temperature is ____________ .

The combustion enthalpies of carbon, hydrogen and methane are -395.5 "kJ" mol^-1, -285.8 "kJ" mol^-1 "and" -890.4 kJ mol^-1 "respectively at " 25^@C . The value of standard formation enthalpy of methane at that temperature is ____________ .

The combustion enthalpies of carbon, hydrogen and methane are -395.5 "kJ" mol^-1, -285.8 "kJ" mol^-1 "and" -890.4 kJ mol^-1 "respectively at " 25^@C . The value of standard formation enthalpy of methane at that temperature is ____________ .

The enthalpy of combustion of one mole of benzene,carbon and hydrogen are-3267 kj mol-1 ,-393.5 kj mol^-1 and -285.8 kj mol^-1 respectively.Calculate the stnadard enthalpy of formation of benzene.

The enthalpy of combustion of methane, graphite and dihydrogen at 298K are -890.3 kJ mol^(-1) ,- 393.5 kJ mol^(-1) and - 285.8 kJ "mol"^(-1) respectively. Enthalpy of formation of CH_(4(g)) will be ____