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NTA Abhyas JEE Main2020ChemistrySolutionsPractice

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

Correct answer

4

Step-by-step solution

Molality of Na + ions (m) = Number of moles of Na + ions Mass of water in kg = 92 g / 23 g mol − 1 1 kg =   4   mol   kg − 1   or   4   m

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