Solutions and Concentrations Quiz

If a water sample contains 0.05 grams of lead (Pb) dissolved in 1000 grams of water, what is the concentration of lead in ppm?

• 5 ppm

• 50 ppm

• 500 ppm

• 5000 ppm

If 100 grams of glucose (C6H12O6) are dissolved in 500 grams of water, what is the molality of the solution?

• 0.5 m

• 1.0 m

• 1.5 m

• 2.0 m

What is the percent by mass of salt in a solution containing 25 grams of salt dissolved in 200 grams of water?

• 10%

• 11.1%

• 12.5%

• 13.2%

Calculate the mole fraction of ethanol (C2H5OH) in a solution containing 30 moles of ethanol and 70 moles of water.

• 0.3

• 0.4

• 0.5

• 0.6

A solution contains 40 mL of ethanol (C2H5OH) dissolved in a total volume of 200 mL. What is the percent by volume of ethanol in the solution?

• 10%

• 15%

• 20%

• 25%

Determine the percent by mass of sugar (C12H22O11) in a solution made by dissolving 50 grams of sugar in 300 grams of water.

• 10%

• 12.5%

• 14.2%

• 16.7%