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Question

calulate the molarity of an ethanol solution ,density of .986g/ml,prepared by dissolving 6 g of ethanol in 75 g of water

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Solution

Dear Student,

molarity = Mass of soluteMolar mass of solute×1000Volume of solution(in ml)Here, Mass of ethanol = 6gMolar mass of ethanol = 46 gMass of solvent = 75 gAnd, density of solution = Mass of solvent + Mass of soluteVolume of solutionor, 0.986 = 75 + 6Volume of solutionor, Volume of solution = 810.986= 82.15 mlTherefore, Molarity = 646×100082.15=1.587 M

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