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Chemistry - Liquid Solution Question with Solution | TestHub

ChemistryLiquid SolutionMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasynumerical

If the density of some lake water is 1.25 g mL^-1and contains 92 g of Na⁺ions per kg of water, calculate the molality of Na⁺ions in the lake.

Answer:

4.00

Solution:

Molality of ${Na}^{+}$ ions (m)
$= \frac{Number of moles of {Na}^{+} ions}{Mass of water in kg}$
$= \frac{(92 g) / ({23 g mol}^{- 1})}{(1 kg)}$
$= 4 mol {kg}^{- 1} or 4 m$

Stream:NTA_ABHYASSubject:ChemistryTopic:Liquid SolutionSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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