Question : The molecular mass of a gas is:
Option 1: twice its vapour pressure
Option 2: equal to its vapour pressure
Option 3: half its vapour pressure
Option 4: not related to its vapour pressure
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Correct Answer: twice its vapour pressure
Solution : The correct option is twice its vapour pressure .
The vapour pressure of a substance is the pressure exerted by its vapour when the substance is in equilibrium with its liquid (or solid) phase. Since any gas has a molecular mass that is twice as dense as hydrogen, which has two atoms per molecule, it has a vapour pressure that is twice as high.
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