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

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

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Stoichiometry
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the

Vapor follows the ideal gas law
Volume in the liquid state is negligible compared with that in the vapor state
Molal latent heat of vaporisation is constant within the limited temperature range
All of these

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