1) KOH and NaOH are dissolved in water to form a 2.48 molar solution. If 42.9 g of NaOH are used and the resulting solution has a volume of 1673 mL, how much of the pure KOH was in the solution?
1) KOH and NaOH are dissolved in water to form a 2.48 molar solution. If 42.9 g of NaOH are
used and the resulting solution has a volume of 1673 mL, how much of the pure KOH was
in the solution?
2) Sucrose C12H22O11 and ethyl alcohol C2H3OH are mixed to form a 14.1 %wt solution. If the
density of the solution is 1.15 g/mL, find the molar concentration of the solution.
3) A sample of exhaust gas from a reactor is composed of 0.0082 %wt SO3. Find the
concentration in part per million. Find the mole fractions of both solute and solvent.
4) Find the molecular weight of an unknown substance if dissolving 1.42 g of it in 25.0 g of
pure benzene lowers the freezing point by 1.96 °C.
5) In order to find the molecular weight of hemoglobin 0.500 g was dissolved in enough water
in a volumetric flask to give 100.0 mL solution. The osmotic pressure of this solution was
then measured at 25 °C and found to be 1.35 mmHg. Calculate the molecular weight of
hemoglobin and determine the boiling point of the solution.
6) Estimate the freezing point of an antifreeze mixture made up by combining one volume of
ethylene glycol, having a formula of (CH2OH)2 and a density of 1.11 g/cm3, with two volumes
of water.
7) A purely organic mixture was formed by combining benzene and toluene. The vapor
pressure of pure benzene is 118.2 mmHg and that of pure toluene is 36.7 mmHg. If the
mole fraction of benzene is 0.3876, what is the total pressure created by the solution?
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