1. Chapter 20 Concentration

2. Molarity (M) Moles of solute per liter of solution. Molarity = moles of solute liters of solution

3. What is the molarity of a solution prepared by dissolving 21.0 g of CaCl 2 in 500.0 mL of solution? 0.378M CaCl 2

4. What is the molarity of a solution prepared by dissolving 48.4 g of CaCl 2 in 100.0 mL of solution?.872 M CaCl 2

5. What is the molarity of a solution prepared by dissolving 48.4 g of CaCl 2 in 100.0 mL of solution? 4.36 M CaCl 2

6. molality (m) Moles of solute per kilogram of solvent. molality = moles of solute kg of solvent

7. What is the molality of a solution prepared by dissolving 92.3 g of KF in 100.0g of water? 15.9m KF

8. What is the molality of a solution prepared by dissolving 20.0g of NH 4 Cl in 400.0g of water? 0.935m NH 4 Cl

9. What is the molality of a solution prepared by dissolving 20.0g of NH 4 Cl in 400.0g of water? 0.935m NH 4 Cl

10. Mole Fraction (X) moles of component per total moles of solution. mole fraction = moles of component total moles in solution

11. What is the mole fraction of C 4 H 10 O in a solution containing 75.6g of C 10 H 8 and 600.0g of C 4 H 10 O? X C 4 H 10 O = 0.932

12. What is the mole fraction of C 2 H 6 O in a solution containing 67.4g of C 9 H 7 N and 200.0g of C 2 H 6 O? X C 2 H 6 O = 0.893

13. What is the mole fraction of C 2 H 6 O in a solution containing 67.4g of C 9 H 7 N and 200.0g of C 2 H 6 O? X C 2 H 6 O = 0.893

14. Percent Solution by mass Represents the number of grams of solute per 100 grams of solution. % solution = mass of solute mass of solution X 100

15. A solution contains 130g of HCl in 750g of water. What is the percent by mass of this HCl solution? 14.8% HCl

16. What is the mass percent of a solution containing 67.4g of C 9 H 7 N in 200.0g of C 2 H 6 O? 25.2% C 9 H 7 N

17. What is the mass percent of a solution containing 67.4g of C 9 H 7 N in 200.0g of C 2 H 6 O? 25.2% C 9 H 7 N

18. Homework Worksheet: Concentration