Quiz: Concentration Units

1. A homogeneous mixture of two or more substances is a(n)
a. compound
b. solution
c. element
2. In a solution, the host substance is the
a. solvent
b. solute
c. mixture
3. The solute is the
a. host substance
b. solid phase only
c. dissolved substance
4. Measuring the relative mass of the constituents of a solution is known as
a. relative masses
b. mass percents
c. common mass
5. A solution is made by mixing 250.0 g of hexane and 50.0 g of octanol. What is the mass percent of the octanol?
a. 83.3%
b. 16.7%
c. 20.0%
6. A solution of sodium chloride and water consists of 3.0 moles of sodium chloride and 7.0 moles of water. What is the mole fraction of sodium chloride?
a. 0.43 moles
b. 0.70 moles
c. 0.30 moles
7. The number of moles of solute per kilogram of solvent is known as
a. molarity
b. molality
c. solubility
8. The term aqueous solution means the
a. solution is seawater
b. solvent is water
c. solute is water
9. If 1.25 moles of NaOH is dissolved in 500.0 mL of water, the molarity of the solution is
a. 0.400 M
b. 2.500 M
c. 1.250 M
10. In a 4.0 m aqueous solution, the number of moles of solute dissolved in 250 g of water is
a. 16
b. 0.063
c. 1.0
11. If 10.0 g of NaCl is dissolved in 500.0 g of water, what is the molality of the solution? (The molar mass of NaCl is 58.45 g/mol.)
a. 0.34 m
b. 2.90 m
c. 0.086 m
12. A solution is made by mixing 100.0 g of glucose (molar mass = 180.16 g/mol) with enough water to make 750. mL of solution. What is the molarity of this solution?
a. 0.416 M
b. 0.740 M
c. 2.40 M

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