51) To make a 2.00 m solution, one could take 2.00 moles of solute and add A) 1.00 L of solvent. B)

 

51) To make a 2.00 m solution, one could take 2.00 moles of solute and add

A) 1.00 L of solvent.

B) 1.00 kg of solvent.

C) enough solvent to make 1.00 L of solution.

D) enough solvent to make 1.00 kg of solution.

52) What molality of pentane is obtained by dissolving 5.0 g pentane, C5H12, in 245.0 g hexane, C6H14?

A) 0.020 m

B) 0.024 m

C) 0.28 m

D) 20. m

53) A solution is 2.25% by mass NaHCO3. How many grams of NaHCO3 are in 450.0 g of solution?

A) 0.500 g

B) 10.1 g

C) 200 g

D) 225 g

54) How many grams of KBr are required to make 650. mL of a 0.115 M KBr solution?

A) 0.628 g

B) 5.65 g

C) 8.90 g

D) 74.8 g

55) What is the molality of a glucose solution prepared by dissolving 18.0 g of glucose, C6H12O6, in 125.9 g of water?

A) 7.94 × 10-4 m

B) 0.143 m

C) 0.695 m

D) 0.794 m

56) Aqueous solutions of 30% (by mass) hydrogen peroxide, H2O2, are used to oxidize metals or organic molecules in chemical reactions. Given that the density of the solution is 1.11 g/mL, calculate the molarity.

A) 0.794 M

B) 6.78 M

C) 9.79 M

D) 12.6 M

57) Aqueous solutions of 30.0% (by mass) hydrogen peroxide, H2O2, are used to oxidize metals or organic molecules in chemical reactions. Calculate the molality of this solution.

A) 0.974 m

B) 6.78 m

C) 9.79 m

D) 12.6 m

58) Sodium hydroxide is available commercially as a 50.0% by weight aqueous solution. The density of the solution is 1.53 g/mL. Calculate the molarity of this sodium hydroxide solution.

A) 0.450 M

B) 19.1 M

C) 25.0 M

D) 125. M

59) Sodium hydroxide is available commercially as a 50.0% by weight aqueous solution. Calculate the molality of this sodium hydroxide solution.

A) 0.450 m

B) 19.1 m

C) 25.0 m

D) 125. m

60) A 1.30 M solution of CaCl2 in water has a density of 1.11 g/mL. What is the molality?

A) 1.17 m CaCl2

B) 1.25 m CaCl2

C) 1.35 m CaCl2

D) 1.44 m CaCl2