What is the lightest gas?

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Multiple Choice

What is the lightest gas?

Explanation:
Lightness of a gas comes from its mass per amount of substance. At the same temperature and pressure, all gases take up the same volume per mole (the idea from the ideal gas behavior), so the lighter the molecule, the lower the density of the gas. Among these options, hydrogen exists as H2 with a molar mass of about 2 g/mol, while helium is 4 g/mol, nitrogen is 28 g/mol, and oxygen is 32 g/mol. That makes hydrogen the lightest gas by a wide margin.

Lightness of a gas comes from its mass per amount of substance. At the same temperature and pressure, all gases take up the same volume per mole (the idea from the ideal gas behavior), so the lighter the molecule, the lower the density of the gas. Among these options, hydrogen exists as H2 with a molar mass of about 2 g/mol, while helium is 4 g/mol, nitrogen is 28 g/mol, and oxygen is 32 g/mol. That makes hydrogen the lightest gas by a wide margin.

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