Density of dry air containing only $\mathrm{N}_2$ and $\mathrm{O}_2$ is $1.15 \mathrm{~g} / \mathrm{L}$ at $740 \mathrm{~mm}$ of $\mathrm{Hg}$ and $300 \mathrm{~K}$. What is $\%$ composition of $\mathrm{N}_2$ by weight in the air?

JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

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Density of dry air containing only

\mathrm{N}_2

and

\mathrm{O}_2

1.15 \mathrm{~g} / \mathrm{L}

740 \mathrm{~mm}

\mathrm{Hg}

and

300 \mathrm{~K}

. What is

\%

composition of

\mathrm{N}_2

by weight in the air?

View answer and explanation

Correct option: C

70.02 \%

Option C (

70.02 \%

) is correct because it is calculated using the ideal gas law and weighted average molar mass to find the percentage composition of N2 by weight.

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