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[Solved] 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.

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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.

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Number of moles present in 92 g of Na+ ions = \(\frac{92\ g}{23 \ g \ mol^{-1}}\)

= 4 mol

Therefore, molality of Na+ ions in the lake = \(\frac{4 \ mol}{1 \ kg}\)

= 4 m

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