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Hess’s law states that;
A
The standard enthalpy of an overall reaction is the sum of the enthalpy changes in individual reactions at the same temperature.
B
Enthalpy of formation of a compound is same as the enthalpy of decomposition of the compound into constituent elements, but with opposite sign.
C
At constant temperature the pressure of a gas is inversely proportional to its volume.
D
The mass of a gas dissolved per litre of a solvent is proportional to the pressure of the gas in equilibrium with the solution.
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