Calculate the standard enthaly of formation of Methane. Given that the standard enthalpy of combustion of Methane, carbon and Hydrogen are -893.3kJ, -3.93kJ and -285.8kJ respectively.

Calculate the standard enthaly of formation of Methane. Given that the

1.	Calculate the standard enthaly of formation of Methane. Given that the standard enthalpy of combustion of Methane, carbon and Hydrogen are -893.3kJ, -3.93kJ and -285.8kJ respectively.
Answer» SOLUTION :Required equation: `C(S)+2H_(2)(g)toCH_(4)(g)DeltaH=?` ……1 `C(S)+O_(2)(g)toCO_(2)(g)DeltaH=-393.5kJ`………2 `H_(2)(g)+1//2O_(2)(g)toH_(2)O(L)DeltaH=-285.8kJ`………….3 `CH_(4)(g)+2O_(2)(g)toCO_(2)(g)+2H_(2)O(l)DeltaH=-890.3kJ`………….4 Eqn. 2 `xx1`, EQ. `3xx2` reverse Eqn 4 add `2H_(2)(g)+O_(2)g to 2H_(2)O(l)DeltaH=-571.6kJ` `CO_(2)(g)+2H_(2)O(l)toCH_(4)(g)+2O_(2)(g)DeltaH=+890.3kJ` `C(S)+2H_(2)(g)toCH_(4)(g)DeltaH=-74.8kJ`