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Hess's law states that...

Hess's law states that

A

The standard enthalpy of an overall reaction is the sum of the enthalpy chages in individual reactions.

B

enthalpy of formation of compoud 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 in inversely proportional to its volume.

D

the mass of a gas dissolved per lit of a solvent is proportional to the pressure of the gas in equilibrium with the solution.

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A
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