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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GIVEN MASS = 92g
MOLAR MASS OF Na+ =23g/mol
MOLALITY = NO. OF MOLES OF SOLUTE /MASS OF SOLVENT (IN Kg)
MOLES OF SOLUTE = 92/23 =4mol
molality = 4/1 = 4 MOLAL
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