CART - Chemistry Acceleration Readiness Solutions and Concentration Questions and Answers

Question 1

A student needs to prepare 500.0 mL of a 0.500 M sodium chloride (NaCl) solution. How many grams of NaCl are required? (Molar Mass of NaCl ≈ 58.44 g/mol)

Accepted Answer

14.6 g

Answer

29.2 g

Answer

58.4 g

Answer

117 g

Question 2

If 25.0 mL of a 4.00 M stock solution of HCl is diluted with water to a final volume of 200.0 mL, what is the molarity of the resulting diluted solution?

Accepted Answer

0.500 M

Answer

1.00 M

Answer

2.00 M

Answer

8.00 M

Question 3

Which of the following concentration units is temperature-dependent because it is based on the volume of the solution?

Accepted Answer

Molarity (M)

Answer

Molality (m)

Answer

Mass percent (%)

Answer

Mole fraction (X)

Question 4

A solution is prepared by dissolving 20.0 g of glucose (C₆H₁₂O₆) in 80.0 g of water. What is the mass percent of glucose in this solution?

Accepted Answer

20.0%

Answer

25.0%

Answer

80.0%

Answer

100.0%

Question 5

A chemist dissolves 58.44 g of NaCl (1 mole) in 500 g of water. Which of the following correctly describes the concentration of this solution?

Accepted Answer

2.0 molal

Answer

1.0 molal

Answer

2.0 molar

Answer

1.0 molar

Question 6

To increase the concentration of a saturated aqueous salt solution at a constant temperature, a student should:

Accepted Answer

Evaporate some of the water.

Answer

Add more salt to the solution.

Answer

Add more water to the solution.

Answer

Stir the solution more vigorously.