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

Changes in heat of reaction
None of these
Reaction rate
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.

No component is concentrated at the surface of the solution
The component molecules are non polar and are of almost equal size
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

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Stoichiometry
The heat capacity of a substance is

Lower for liquid state than for gaseous state
Higher for solid state than for liquid state
Equal for solid and liquid states below melting point
Greater for liquid state than for solid state

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