Chapter 13 Homework 13.42 Calculate the concentration of each solution in mass percent. a. 132 g KCl in 598 g H2O SOLUTION: % ππ¦ πππ π = πππ π ππ π πππ’π‘π π‘ππ‘ππ πππ π ππ π πππ’π‘πππ % ππ¦ πππ π = × 100 132 π πΎπΆπ × 100 = 18.1% ππ¦ πππ π 132 π πΎπΆπ + 598 π π»2 π b. 22.3 mg KNO3 in 2.84 g H2O 22.3 ππ % ππ¦ πππ π = 1π = 0.0223 π 1000 ππ 0.0223 π πΎππ3 × 100 = 0.779 % ππ¦ πππ π 0.0223 π πΎππ3 + 2.84 π π»2 π c. 8.72 g C2H6O in 76.1 g H2O % ππ¦ πππ π = 8.72 π πΆ2 π»6 π × 100 = 10.3% ππ¦ πππ π 8.72 π πΆ2 π»6 π + 76.1 π π»2 π 13.50 Determine the amount of potassium chloride in each solution. a. 19.7 g of a solution containing 1.08% KCl by mass SOLUTION: UNITS! UNITS! UNITS! Remember % ππ¦ πππ π β‘ π π πππ’π‘π 100 π π πππ’π‘πππ 19.7 π π πππ’π‘πππ 1.08 π πΎπΆπ = 0.213 π πΎπΆπ 100 π π πππ’π‘πππ b. 23.2 kg of a solution containing 18.7% KCl by mass 23.2 ππ π πππ’π‘πππ 1000 π 18.7 π πΎπΆπ = 4338 π πΎπΆπ 1 ππ 100 π π πππ’π‘πππ OR 23.2 ππ π πππ’π‘πππ 18.7 ππ πΎπΆπ = 4.338 ππ πΎπΆπ 100 ππ π πππ’π‘πππ c. 38 mg or a solution containing 12% KCl by mass 38 ππ π πππ’π‘πππ 12 ππ πΎπΆπ = 4.56 ππ πΎπΆπ 100 ππ π πππ’π‘πππ 13.60 Calculate the molarity of each solution. a. 1.54 mol of LiCl in 22.2 L of solution 1.54 πππ πΏππΆπ = 0.069 π πΏππΆπ 22.2 πΏ π πππ’π‘πππ b. 0.101 mol of LiNO3 in 6.4 L of solution 0.101 πππ πΏπππ3 = 0.0158 π πΏπππ3 6.4 πΏ d. 0.0323 mol of glucose in 76.2 mL of solution 0.0323 πππ πππ’πππ π = 0.424 π πππ’πππ π 1πΏ 76.2 ππΏ 1000 ππΏ 13.62 Calculate the molarity of each solution. a. 33.2 g of KCl in 0.895 L of solution 1 πππ πΎπΆπ 74.55 π = 0.498 π πΎπΆπ 0.895 πΏ 33.2 π πΎπΆπ b. 61.3 g of C2H6O in 3.4 L of solution 1 πππ πΆ2 π»6 π 46.068 π = 0.391 π πΆ2 π»6 π 3.4 πΏ 61.3 π πΆ2 π»6 π c. 38.2 mg of KI in 112 mL of solution 1 π 1 ππππΎπΌ 38.2 ππ πΎπΌ 1000 ππ 166.1 π = 0.00152 π πΎπΌ 1πΏ 112 ππΏ 1000 ππΏ 13.82 A 3.5 L sample of a 5.8 M NaCl solution is diluted to 55 L. What is the molarity of the diluted solution? SOLUTION: 3.5 πΏ πππΆπ π πππ’π‘πππ 5.8 πππ πππΆπ = 20.3 πππ πππΆπ πΏ 20.3 πππ πππΆπ = 0.369 π πππΆπ 55 πΏ π πππ’π‘πππ 13.92 Consider the reaction: K2S (aq) + Co(NO3)2 (aq) β 2 KNO3 (aq) + CoS (s) What volume of 0.225 M K2S solution is required to completely react with 175 mL of 0.115 M Co(NO3)2? 1 πΏ 0.115 πππ πΆπ(ππ3 )2 1 πππ πΎ2 π 1πΏ 1000 ππΏ πΏ 1 πππ πΆπ(ππ3 )2 0.225 πππ πΎ2 π = 0.089 πΏ πΎ2 π π πππ’π‘πππ 175 ππΏ πΆπ(ππ3 )2
© Copyright 2026 Paperzz