# Solved > 11) A solution is prepared by adding 1.43:1936536 …

11) A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

A) 1.61 × 10-3

B) 622

C) 0.622

D) 1.27 × 103

E) 1.61

12) A solution is prepared by dissolving 16.2 g of benzene (C6H6) in 282 g of carbon tetrachloride (CCl4) The concentration of benzene in this solution is ________ molal. The molar masses of C6H6 and CCl4 are 78.1 g mol-1 and 154 g mol-1, respectively.

A) 7.36 × 10-4

B) 0.736

C) 0.102

D) 0.0543

E) 5.43

13) What is the weight percent of vitamin C in a solution made by dissolving 6.50 g of vitamin C, C6H8O6, in 55.0 g of water?

A) 0.547%

B) 1.21%

C) 10.6%

D) 11.8%

14) What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine, C8H10N4O2, in 75 g of benzene, C6H6?

A) 0.010%

B) 0.011%

C) 10%

D) 11%

15) How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

A) 54.0 g

B) 74.2 g

C) 87.5 g

D) 114 g

16) A solution of LiCl in water is 20.0 wt% LiCl. What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

A) 0.0960

B) 0.106

C) 0.472

D) 4.44

17) What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C2H5OH, in 53.6 g of water?

A) 0.176

B) 0.213

C) 0.352

D) 0.545

18) What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane, C6H14?

A) 0.0715

B) 0.0770

C) 0.133

D) 0.154

19) What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?

A) 0.34

B) 0.37

C) 0.25

D) 0.52

20) A solution is 2.25% by weight NaHCO3. How many grams of NaHCO3 are in 150.0 g of solution?

A) 1.50 g

B) 3.38 g

C) 66.7 g

D) 225 g

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