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

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

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Stoichiometry
An ideal gas can be liquified, because

It gets solidified directly without becoming liquid
Forces operative between its molecules are negligible
Its molecular size is very small
Its critical temperature is more than 0°C

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