Percent by Mass (#1-5) and Molarity Calculations



Percent by Mass (#1-3) and Molarity (#4-15) Calculations Name: ______________ Date: ____

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

2. What is the percentage concentration of 75.0 g of ethanol dissolved in 500.0 g of water?

3. A chemist dissolves 3.50 g of potassium iodate (KIO3) and 6.23 g of potassium hydroxide (KOH) in 805.05 g of water. What is the percentage concentration of each solute in the solution?

4. What is the Molarity of a solution that contains 25.0 g of sodium chloride in 245 mL of solution?

5. How many grams of sodium chloride will be required to make a 1.45 M solution of 555 mL?

6. How many liters of solution can be prepared if 78.9 grams of sodium chloride is used to make a 3.00 M solution?

7. What is the Molarity of a solution that is prepared by using 20.0 grams of sodium hydroxide in enough water to make a 2.00 liter solution?

8. How many moles of sodium hydroxide are contained in 65 mL of a 2.20 M solution of sodium hydroxide?

9. How many liters of solution can be prepared by using 65.4 grams of sodium hydroxide when preparing a 1.55 M solution of sodium hydroxide?

10. What is the Molarity of a solution that contains 17.0 grams of ammonium bromide (NH4Br) in enough water to make 150 mL of solution?

11. How many grams of ammonium bromide are needed to make 125 mL of a 2.00 M solution of ammonium bromide?

12. How many liters of solution can be prepared by mixing 50.0 grams of ammonium bromide with water to make a 1.35 M solution?

13. What is the Molarity of a solution that is produced by mixing 25.0 grams of calcium sulfate in enough water to produce 250 mL of solution?

Percentage by Mass Notes and Examples

***Percent By Mass = grams of solute x 100

(grams of solute + grams of solvent)

1. A solution of sodium chloride is prepared by dissolving 5 g of salt in 550 g of water. What is the concentration as given by percent by mass?

2. What is the percent by mass of a solution prepared by dissolving 4 g of acetic acid in 35 g of water?

Molarity Notes and Examples (Molarity is the moles of a solute per liter of solution)

***Molarity = mol Units are “M”

L

1. What is the molarity of 3.5 L of solution that contains 90 g of sodium chloride?

2. How many moles of HCl are present in 0.8 L of a 0.5 M HCl solution?

3. How many grams of sodium chloride will be required to make 555 mL of a 1.45 M solution?

4. How many liters of solution can be prepared if 78.9 g of sodium chloride is used to make a 3.00 M solution?

5. What is the molarity of a solution that is prepared by using 20 g of sodium hydroxide in enough water to make a 2 L solution?

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