QJEEM19Chccc4: JEE Main 2019 Chemistry - Class 11 JEEM19Chccc4 Solution: A solution of sodium sulphate contains 92 g of Na + ions per…

Question

Verified Solution • 2025–26 Session moderate

A solution of sodium sulphate contains 92 g of Na⁺ ions per kilogram of water. The molality of Na⁺ ions in that solution in mol kg^{$-$ 1} is :

Accepted Answer

Molality of Na⁺ =

\frac{M o l e s o f N a^{+}}{m a s s o f H_{2} O i n k g}

Moles of Na⁺ =

\frac{92}{23}

= 4

Mass of H₂O = 1 kg

∴

Molality =

\frac{4}{1}

= 4

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