Which gas is the lightest among the following?

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Multiple Choice

Which gas is the lightest among the following?

Explanation:
Lightness in gases at the same conditions follows from molar mass. Hydrogen gas has the smallest molar mass—about 2 g/mol for H2—so it is the least dense. Helium is heavier at about 4 g/mol, oxygen as O2 is about 32 g/mol, and argon is about 40 g/mol. Since density increases with molar mass, hydrogen ends up being the lightest among these options.

Lightness in gases at the same conditions follows from molar mass. Hydrogen gas has the smallest molar mass—about 2 g/mol for H2—so it is the least dense. Helium is heavier at about 4 g/mol, oxygen as O2 is about 32 g/mol, and argon is about 40 g/mol. Since density increases with molar mass, hydrogen ends up being the lightest among these options.

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