Solutions

Suppose that a solution was prepared by dissolving 25.0g of sugar into 100g of water. The percent by mass would be calculated by:

• 20% sugar solutions

• 2% sugar solutions

• 200% sugar solutions

• 0.2% sugar solutions

What is the percentage by mass of a solution made by dissolving 0.49 g of potassium sulfate in 12.70 g of water?

• 3% mass of a solution

• 3.72% mass of a solution

• 3.71% mass of a solution

• 0.37% mass of a solution

What is the concentration by % m/v if 67 g are dissolved to make 1.2 L of solution?

• 5.56% mass/volume

• 5.00% mass/volume

• 0.05% mass/volume

• 5.58% mass/volume

A 250 mL solution of hand sanitizer contains 150 mL of propan-2-ol. What is the percentage concentration by volume of propan-2-ol in this solution? Give your answer to the nearest whole percentage.

• 15% volume of propan-2-ol

• 38% volume of propan-2-ol

• 60% volume of propan-2-ol

• 17% volume of propan-2-ol

What is the concentration in % m/v if 0.55 kg of solute is dissolved to make 1.5 L of solution?

• 36.67% m/v concentration

• 3.67% m/v concentration

• 0.37% m/v concentration

• 36.66% m/v concentration

6 g of urea was dissolved in 500 g of water. Calculate the percentage by mass of urea in the solution.

• 1.19% of urea in the solution

• 1.18% of urea in the solution

• 0.01% of urea in the solution

• 2.00% of urea in the solution

58 cm³ of ethyl alcohol was dissolved in 400 cm³ of water to form 454 cm³ of a solution of ethyl alcohol. Calculate the percentage by volume of ethyl alcohol in water.

• 12.78% volume of ethyl alcohol

• 100.88% volume of ethyl alcohol

• 0.13% volume of ethyl alcohol

• 1.01% volume of ethyl alcohol

If a solution is made by taking 40 mL of ethanol and adding enough water to make 240 mL of the solution, what is the percent by volume?

• 16.67% by volume

• 1.67% by volume

• 0.16% by volume

• 16.66% by volume

Determine the volume percent of toluene in a solution made by mixing 40.0 mL of toluene with 75.0 mL of benzene.

• 0.35% of toluene in a solution

• 34.79% of toluene in a solution

• 34.78% of toluene in a solution

• 30% of toluene in a solution

For an aquarium to achieve a salt concentration similar to seawater, it

must contain 3.5 g of sodium chloride per 100 g of water. What is the

percent by mass of sodium chloride in the solution?

• 30.38% of sodium chloride in the solution

• 0.03% of sodium chloride in the solution

• 33.8% of sodium chloride in the solution

• 3.38% of sodium chloride in the solution