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.
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.
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.