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Ideal Gas Equation

Which of the ...

Question

Which of the following gases is least dense when all are measured under the same conditions?

{C O}_{2}

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{C l}_{2}

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{S O}_{2}

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H_{2}

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N O

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Solution

The correct option is C $H_{2}$
Hydrogen gas $H_{2}$ is least dense when all are measured under the same conditions.
$P M = ρ R T$
$ρ \propto M$
Thus, under the same conditions, density is directly proportional to the molar mass. Lower is the molar mass, lower is the density and vice versa.

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