Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is :

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Strategy:
 Molarity is defined as moles of solute per litre of solution. We relate mole fraction to molarity by assuming a total of 1 mole of solution and converting the solvent mass into volume (assuming density is roughly that of water).

Step 1: Define quantities for 1 mole of mixture
Moles of ethanol 
Moles of water 
Mass of water .

Step 2: Calculate volume and molarity
Volume of solution  Volume of water .

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