Stoichiometry
Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity?Vapour pressure of water at 20°C is 17.5 mm Hg.

78.51
80.38
79.62
80

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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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