The density of $3 \mathrm{~M}$ solution of $\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3$ is $1.25 \mathrm{~g~mL}^{-1}.$ Calculate, the mole fraction of $\mathrm{Na}_2 \mathrm{SO}_3.$

JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

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Application +4 | -1

The density of

3 \mathrm{~M}

solution of

\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3

1.25 \mathrm{~g~mL}^{-1}.

Calculate, the mole fraction of

\mathrm{Na}_2 \mathrm{SO}_3.

View answer and explanation

Correct option: A

0.065

Option A (0.065) is correct because the mole fraction is calculated by dividing moles of Na2S2O3 by the total moles of solute and solvent.

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