The standard molar heat of formation of ethane, carbon dioxide and water (liquid) are -21.1, -94.1 and -68.3 kcal respectively. Calculate the standard heat of the following reaction :
`2C_2H_6 (g) + 7O_2(g) to 4CO_2(g) + 6H_2O(l)`

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

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

The molar heats of combustion of C_(2)H_(2)(g) , C (graphite), and H_(2) 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 heat of formation of at 298 K for C Cl_(4)(g), H_(2)O(g), CO_(2)(g) and HCI(g) are -25.5, -57.8, -94.1 and -22.1 kcal mol^(-1) respectively. Calculate Delta_(r)H^(Theta) for the reaction C Cl_(4)(g)+2H_(2)O(g) rarr CO_(2)(g)+4HCl(g) Hint : Delta_(r)H^(Theta) = sum Delta_(f)H_("Products")^(Theta)- sum Delta_(f)H_("Reactants")^(Theta)

The standard heats of formation at 298K for C Cl_(4)(g),H_(2)O(g),CO_(2)(g) and HCl(g) are -25.5,-57.8,-94.1 and -22.1 kcal mol^(-1) respectively. Calculate DeltaH_(298)^(@) for the reaction. C Cl_(4)(g)+2H_(2)O(g)toCO_(2)(g)+4HCl(g) .

Heat of formation of CO_(2)(g), H_(2)O(l) and CH_(4)(g) are -94.0, -68.4 and -17.9 kcal respectively. The heat of combustion of methane is

The heat of combustion of ethyl alcohol is -300 kcal. If the heats of formation of CO_(2)(g) and H_(2)O(l) are -9.3 and -68.5 kcal respectively, calculate the heat of formation of ehtyl alcohol.

The heats of combustion of C_(2)H_(4(g)), C_(2)H_(6(g)) and H_(2(g)) are -1409.4,-1558.3 and -285.6 kJ respectively. Calculate heat of hydrogenation of ethylene.

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

Delta_(f)H^(Theta) per mole of NH_(3)(g). NO(g) , and H_(2)O(l) are -11.04 + 21.60 and -68.32 kcal , respectively. Calculate the standard heat of reaction at constant pressure and at a constant volume for the reaction: 4NH_(3)(g) +5O_(2)(g) rarr 4NO(g) +6H_(2)O(l)