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QUESTION 2.26

If the density of some lake water is 1.25 g mL1 and contains 92 g of Na+ ions per kg of water, calculate the molality of Na+ ions in the lake.


Solution

Molality of Na+ ions (m) =Number of moles Na+ ionsMass of water in kg
=(92g)(23g mol1)(1 kg)
=4 mol kg1 or 4m


Chemistry
NCERT Textbook
Standard XII

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