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11/09/2020 12:36 pm
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If the density of some lake water is 1.25g 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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11/09/2020 12:38 pm
Mass of sodium ions = 92 g
Molar mass of sodium ions = 23g/mol
Number of moles of sodium ions = 92g/23g/mol = 4
Mass of water = 1 kg
Molality = number of moles of sodium ions / Mass of water (in kg) = 4/1 = 4m