The heat of combustion of `CH_(4(g)), C_((g))` and `H_(2(g))` at `25^(@)C` are `-212.4` K cal, -94.0 K cal and -68.4 K cal respectively, the heat of formation of `CH_(4)` will be -

The heat of combustion of CH_(4)(g) , C(graphite) and H_(2)(g) are - 20 Kcal, - 40 Kcal and -10 Kcal respectively. The heat of formation of methane is

The heats of combustion for C, H_(2) and CH_(4) are -349, -241.8 and -906.7 kJ respectively. The heat of formation of CH_(4) is

The heat of combustion of CH_(4)(g) , C (graphite), H_(2)(g) are 20kcal, -40 kcal-10 kcal respectively. The heat of formation of methane is

Standard heat of formation of CH_4(g), CO_2(g) and water at 25^@C are -17.9, -94.1 K and -68.3 kcal mol^-1 respectively. Calculate the heat change (in kcal) in the following reaction at 25^@C: CH_4(g)+2O_2(g)=CO_2(g)+2H_2O(g)

The heats of formation of C_(6)H_(6)(l),H_(2)O(l) and CO_(2)(g) are 11.70,-68.4 and -94.0 kcal respectively. Calculate the heat of combustion of benzene (l).

At 298 K, the heats of formation fo C Cl_(4) (g), H_(2)O(g), CO_(2)(g) and HCl(g) are -25, -57, -94 and -22 K.cal mol^(-1) respectively. The DeltaH of the reaction: C Cl_(4)(g) +2H_(2)O rarr CO_(2) (g) +4HCl(g)