**The following problems are taken from T. L. Brown, H.
E. Lemay, B. E. Bursten, & J. R. Burdge, Chemistry: The Central Science,
Ninth ^{} Edition, Chapter 13. To see the solution to a problem or to
return from the solution, click on the number of the problem.**

24**)** **(a) What is the mass percentage of iodine (I _{2}) in a solution containing 0.045 mol I_{2} in 115 g of CCl_{4}?**

** (b) Seawater contains 0.0079 g Sr ^{2+} per kilogram of water. What is the concentration of Sr^{2+} measured in ppm?**

28**)** ** What is the molarity of each of the following solutions: **

** (a) 15.0 g Al _{2}(SO_{4})_{3} in 0.350 L solution **

** (b) 5.25 g Mn(NO _{3})_{2}·2H_{2}O in 175 mL of solution **

** (c) 35.0 mL of 9.00 M H _{2}SO_{4} diluted to 0.500 L?**

40**)** ** Commercial aqueous nitric acid has a density of 1.42 g/mL and is 16 M. Calculate the percent HNO _{3} by mass in the solution. **

** **

56**)** ** Calculate the freezing and boiling points of each of the following solutions: **

** (a) 0.40 m glucose in alcohol **

** (b) 20.0 g of C _{10}H_{22} in 455 g CHCl_{3} **

** (c) 0.45 mol ethylene glycol and 0.15 mol KBr in 150 g H _{2}O **

** **

60**)** ** Lauryl alcohol is obtained from coconut oil and is used to make detergents. A solution of 5.00 g of lauryl alcohol in 0.100 kg of benzene freezes at 4.1°C. What is the molar mass of lauryl alcohol?**