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#1

Nitrogen, N2, is soluble in blood and can cause intoxication at sufficient concentration. For this reason, the US Navy advises divers using compressed air not to go below 125 feet. The total pressure at this depth is 9.21 atm. If the solubility of nitrogen at 1.00 atm is 1.75 × 10-3 g/100 mL of water and the mole percent of nitrogen in air is 78.1, what is the solubility of nitrogen in 100 mL water from air at 9.21 atm?

#2

Lauryl alcohol, C12H25OH (MM = 186.33 g/mol), is prepared from coconut oil; it is used to make sodium lauryl sulfate, a synthetic detergent. What is the molality of lauryl alcohol in a solution of 9.30 g lauryl alcohol dissolved in 165 g ethanol, C2H5OH?

#3

Caffeine, C8H10N4O2, is a stimulant found in tea and coffee. A sample of the substance was dissolved in 45.0 g of chloroform, CHCl3, to give a 0.0726 m solution. How many grams of caffeine were in the sample?

#4

An antiseptic solution contains hydrogen peroxide, H2O2 (MM = 34.016 g/mol), in water (MM = 18.016 g/mol). What is the mole fraction of hydrogen peroxide if the solution is 0.89 m?

#5

A beverage contains tartaric acid, H2C4H4O6, a substance obtained from grapes during wine making. If the beverage is 0.265 M tartaric acid, what is the molal concentration? The density of the solution is 1.016 g/mL.

#6

What is the vapor pressure at 23 C of a solution of 4.25 g of naphthalene, C10H8 (MM = 128.2 g/mol), in 25.6 g benzene, C6H6 (MM = 78.11 g/mol)? The vapor pressure of pure benzene at 23 C is 86.0 mmHg; the vapor pressure of naphthalene can be neglected.

#7

Urea, (NH2)2CO (MM = 60.06 g/mol), is dissolved in 100.0 g water (Kf = 1.858 C/m). The solution freezes at -0.176 C. How many grams of urea were dissolved to prepare this solution?

#8

Arginine vasopressin is a pituitary hormone that helps regulate the amount of water in the blood by reducing the flow of urine from the kidneys. An aqueous solution containing 68.01 mg of vasopressin in 100.0 mL solution has an osmotic pressure at 25 C of 11.65 mmHg. What is the molar mass of the hormone?

#9

In a mountainous location, the boiling point of pure water is found to be 96.8 C. How many grams of sodium chloride (MM = 58.5 g/mol) must be added to 1 kg of water to bring the boiling temperature to 100.0 C assuming sodium chloride is a strong electrolyte.

#10

An aqueous solution is 8.01 % lithium chloride, LiCl (MM = 42.39 g/mol), by mass. The density of the solution is 1.127 g/mL. What is the molality of the solution?

#11

An aqueous solution is 13.19 % lithium chloride, LiCl (MM = 42.39 g/mol), by mass. The density of the solution is 1.127 g/mL. What is the molarity of the solution?

#12

Maltose, C12H22O11, is a sugar produced by malting (sprouting) grain. A solution of maltose at 25 C has an osmotic pressure of 3.00 atm. What is the molar concentration of maltose?

#13

A solution is made up by dissolving 10.5 g Na2CO3•10H2O (MM = 286.2 g/mol) in 100 g water. What is the molality of this solution?

#14

An aqueous solution is 24.1 % by mass of sodium thiosulfate pentahydrate, Na2S2O3• 5H2O (MM = 248.2 g/mol). What is the molarity of this solution, which has a density of 1.174 g/mL at 20.0 C?

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