Stoichiometry
Hess's law of constant heat summation is based on conservation of mass. It deals with

Reaction rate
None of these
Changes in heat of reaction
Equilibrium constant

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Stoichiometry
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The attractive forces between like and unlike molecules are almost equal
No component is concentrated at the surface of the solution
The component molecules are non polar and are of almost equal size

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