A weighed quantity of a gas is collected over water at $25^{\circ} C$ and $742 mm Hg .$ The molar mass a of the is to be determined at standard temperature and pressure. If the vapor pressure of water is ignored during the calculation, what is the effect on the calculated pressure and calculated molar mass of the gas?

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Pressure Molar mass

high high

Pressure Molar mass

law high

Pressure Molar mass

law law

Pressure Molar mass

high law

answer is C.

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Detailed Solution

Relation of pressure and molar mass can be given as;

$P \propto \frac{1}{M};$

So, P is high and M is low.

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