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
D) 1.27 × 103
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
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?
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?
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.
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?
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?
19) What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?
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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