Stoichiometry
An ideal gas can be liquified, because

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

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Stoichiometry
Heat of reaction is not influenced by

The route/method through which final products are obtained
None of these
The physical state (e.g., solid, liquid or gaseous) of reactants and products
Whether the reaction is carried out at constant temperature or constant pressure

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