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  1. A 1.37 M solution of citric acid (H3C6H5O7) in water has a density of 1.10 g/cm3. Calculate the mass percent, molality, mole fraction of the citric acid.




















  1. A solution is prepared by mixing 25 mL pentane (C5H12, density =0.63 g/mL) with 45 mL of hexane (C6H14, density = 0.66 g/mL). Assuming that the volumes add on mixing, calculate the mass percent, mole fraction, molality and molarity of the pentane.



















  1. A bottle of wine contains 12.5% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/mL. Calculate the concentration of ethanol in wine in terms of mass percent and molality.