In this worksheet, we will practice using the equation n = cV to calculate the volume or concentration of a solution or the mass or moles of solute present.

**Q1: **

If 4.94 g of is dissolved in water to make a final volume of 2.0 L, what is the molarity of the solution?

- A 2.5 M
- B 0.088 M
- C 0.025 M
- D 0.044 M
- E 0.18 M

**Q2: **

How many milliliters of a 0.100 M potassium permanganate stock solution would be needed to make 100 mL of 0.0250 M potassium permanganate?

**Q3: **

An aqueous solution of 62.00 g iron(III) iodide is diluted to a volume of 725 mL. Calculate the concentration of iodide ions in this solution.

**Q4: **

A solution is prepared by dissolving 1.60 g of solid in 50.0 mL of 0.100 M aqueous . Assuming the volume of the solution does not change, calculate the concentration of chloride ions in this solution.

**Q5: **

Calculate the mass of methanol that must be added to water to prepare 2.66 L of a 1.35 M solution.

**Q6: **

A 0.2104 M aqueous solution of sodium sulfate has a total volume of 900 mL.

Calculate the mass of sodium ions in this solution.

Calculate the mass of sulfate ions in this solution.

**Q7: **

Calculate the mass of sodium chloride that must be added to water to prepare 80.0 mL of a 0.800 M solution.

**Q8: **

The concentration of acetic acid in a sample of vinegar is 0.839 M. What volume of this vinegar contains 75.6 g of acetic acid?

**Q9: **

A 355 ml soft drink sample contains 0.133 mol of sucrose (table sugar). What is the molar concentration of sucrose in the beverage?

**Q10: **

How much sugar (in moles) is contained in a modest sip (∼10 mL) of a soft drink, if the concentration of sugar is 0.375 M?

**Q11: **

How many grams of are contained in 0.250 L of a 5.30 M solution?

**Q12: **

How many grams of (110.98 g/mol) are contained in 250.0 mL of a 0.200 M solution of calcium chloride?

**Q13: **

A liter of air contains mol argon. What is the mass of in a liter of air?

**Q14: **

What volume of a 1.50-M solution contains ?

**Q15: **

If 0.850 L of a 5.00-M solution of copper nitrate, , is diluted to a volume of 1.80 L by the addition of water, what is the molarity of the diluted solution?

**Q16: **

What is the concentration of the solution that results from diluting 25.0 mL of a 2.04 M solution of to 500.0 mL?

**Q17: **

What volume of can be prepared from 11 mL (0.011 L) of ?

**Q18: **

A laboratory experiment calls for . What volume of can be prepared from 0.250 L of ?

**Q19: **

What volume of 1.59 M aqueous is required to prepare 5.00 L of 0.100 M aqueous ?

**Q20: **

What volume of a 0.575-M solution of glucose, , can be prepared from 50.00 mL of a 3.00-M glucose solution?

**Q21: **

Concentrated hydrochloric acid is an aqueous solution containing by mass. The density of this solution is 1.19 g/mL. What mass of is contained in 0.500 L of this solution?

**Q22: **

What is the mass of 2.561 mol of gold?

**Q23: **

Rubbing alcohol (isopropanol) is usually sold as a vol aqueous solution. If the density of isopropyl alcohol is 0.785 g/mL, calculate to 3 significant figures the number of grams of isopropyl alcohol present in a 355 mL bottle of rubbing alcohol.

**Q24: **

Wine is approximately ethanol by volume. Ethanol has a molar mass of 46.06 g/mol and a density 0.789 g/mL. How many moles of ethanol are present in a 750 mL bottle of wine?

**Q25: **

Which of the following is a valid expression of molality ?

- A mol/L
- B kg/mol
- C g/mol
- D mol/kg
- E L/g