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InterviewSolution
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A 0.750 L aqueous solution contains 90.0 g of ethanol, C2H5OH. Calculate the molar concentration of thesolution in mol L |
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Answer» 1.The question asks for concentration,which means finding molarity, or:moles solutelitre solution2.To convert mass of ethanol to moles, we need to find the molar mass of C2H5OH using the periodic table. Molar mass is 46.1 g·mol-13.Molarity also requires volume; the question tells us we have 0.750 L. Put this information together to solve the problem, arranging the information to end up with the desired unit: molL=90.0 g×1 mol46.1 g×10.750 L=2.60 molLOur final answer: [C2H5OH ] = 2.60M |
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