Standard heat of formation of `C_2H_6(g),CO_2(g)` and `H_2O(l)` are -21.1,-94.1 and` -68.3 Kcal mol^(-1)` respectively calculate standard heat of combustion of `C_2H_6(g)`

At 25^(@)C and 1 atm, heat of formation of C_(2)H_(4) (g), CO_(2)(g) and H_(2)O(l) are 52 " kJ mol"^(-1), -394 " kJ mol"^(-1) and -286 " kJ mol"^(-1) respectively. Calculate the heat of combustion of C_(2)H_(4)(g) .

The standard molar heat of formation of ethane, carbon dioxide and liquid water are -21.1, -94.1 and -68.3 kcal respectively. Calculate the standard molar heat of combustion of ethane.

The standard heat of formation of C_6 H_5 COOH (s) CO_2 (g) & H_2 O (1) at 300K are -408, - 393, & -286 Kj mol^-1 respectively. Calculate the heat of Combustion of Benzoic acid.

Molar heats of combustion of C_(2)H_(2)(g), C (graphite) and H_(2)(g) " are " -310.62 " kcal ", -94.05 " kcal " and -68.32 kcal respectively. Calculate the standard heat of formation of C_(2)H_(2)(g) .

The standard heats of formation at 298 K for C CI_4(g) , H_2O (g), CO_2 (g) and HCI (g) are -25.5, -57.8, -94.1 and -22.1 kcal mol^-1 respectively,calculate DeltaH "_(298K)^@ , for the reaction : C Cl_4 (g) + 2H_2O (g) to CO_2 (g) + 4HCI (g)

The standard molar heat of formation of ethane, CO_2 and H_2O(l) are respectively -21.1, -94.1 and -68,3 kcal. The standard molar heat of combustion (in kcal) of ethane will be

The molar heats of combustion of C_2H_2(g),C(graphite) and H_2(g) are -310.62, -94.05, -68.32 kcal respectively. The heat of formation of acetylene Is

The heat of reaction for the following reaction (DeltaH^(0)) at 25^(@)C temperatue is -1368 kJ: C_(2)H_(5)OH(l)+3O_(2)(g) to 2CO_(2)(g)+3H_(2)O(l) If the enthalpy of formation of CO_(2)(g) and H_(2)O(l) at 25^(@)C are -393.5 and -285.8 kJ*mol^(-1) respectively, then what will be the value of the standard enthalpy of formation of C_(2)H_(5)OH(l) ?

The standard heat of formation of NO_2(g) and N_2O_4(g) are 8.0 and 2.0 kcal mol^-1 respectively. The heat of dimarization of NO_2 in kcal is: