"At `25^(@)C`, the standard heat of combustion of graphite is `-94300cal*mol^(-1)`"-what does it mean?

At 25^(@)C the standard heat of formation of liquid benzene is +49.0 kJ*mol^(-1) -what does it mean?

"At 25^(@)C , the standard heat of formation of H_(2)O(l) is -285.83kJ*mol^(-1) "-What does it mean?

At 25^(@)C , the standard heat of formation for Br_(2)(g) is 30.9kJ*mol^(-1) . At this temperature, the heat of vaporisation for Br_(2)(l) is-

At 25^(@)C the standard heat of formation of liquid H_(2)O is -286.0 kJ*mol^(-1) . Calculate the change in standard internal energy for this formation reaction.

At 25^(@)C , the heat of combustion of naphthalene at constant volume is -1230 " kcal mol"^(-1) . Calculate the heat of reaction at constant pressure and 25^(@)C .

At 25^(@)C , the bond dissociation energy of N_(2)(g) is 946 kJ*mol^(-1) . What does it mean ? What would be the standard atomisation enthalpy of N_(2)(g) at 25^(@)C ?

If 0.5 kg of coal on burning raises the temperature of 50 L of water from 20^(@)C to 90^(@)C, then the heat of combustion of coal is nxx10^(6)" cal . Kg"^(-1) . Find the value of n.

"Pressure coefficient of a gas is (1/273)^@C^-1 "----what does it mean?

When 1 g of graphite is completely burnt in a bomb calorimeter, the temperature of the bomb and water rises from 25^(@)C to 30.5^(@)C . If the heat capacity of the calorimeter is 5.96kJ*""^(@)C^(-1) , then the heat of combustion per mole of graphite at constant volume is-

22320 cal of heat is supplied to 100 g of ice at 0^(@)C . If the latent heat of fusion of ice is 80cal g^(-1) and latent heat of vaporization of water is 540cal g^(-1) , the final amount of water thus obtained and its temperature respectively are