Concentration Mastering Chemistry

What is the molality of a solution prepared from 25.0 g NaCl and 100.0 g H2O?

4.28 m NaCl

What is the molality of a solution prepared from 5.25 g LiF and 45.0 g H2O?

4.49 m LiF

What is the molality of a solution prepared from 80.3 g I2 and 100.0 mL hexane? The density of hexane is 0.655 g/mL.

4.82 m

What is the molarity of a solution containing 2.8 moles of LiCl and a volume of 5.00 × 102 mL?

5.6 M LiCl

What is the molarity of a solution containing 1.54 moles of NaOH and a volume of 2.5 × 102 mL?

6.2 M NaOH

What is the volume/volume percent of a solution prepared from 12.3 mL ethanol in 150.0 mL water? Assume volumes are additive.

7.58% (v/v) ethanol

What is the molarity of a solution containing 6.38 moles of HCl and a volume of 1.8 L?

3.5 M HCl

What is the mole fraction of O2 in a sample with 1.25 grams CH4, 45.2 g N2, and 13.4 g O2?

.199

What is the mole fraction of O2 in a sample with 3.50 grams of O2 and 25.6 g N2?

0.107

What is the mole fraction of Ar in a sample with 12.4 grams Ar, 35.0 g N2, and 2.91 g He?

0.136

What is the molarity of a solution containing 45.3 grams of Mg(NO3)2 and a volume of 2.25 L?

0.136 M Mg(NO3)2

What is the molarity of a solution containing 110.3 grams of CaBr2 and a volume of 1.50 L?

0.368 M CaBr2

What is the molarity of a solution containing 28.6 grams of NH3 and a volume of 3.5 L?

0.48 M NH3

What is the molality of a solution prepared from 13.2 g MgCl2 and 175.0 g H2O?

0.794 m MgCl2

What is the mass percent (m/m) of a solution containing 55 grams of calcium chloride, CaCl2, and 125 grams of water?

31% (m/m) CaCl2

What is the molarity of a solution prepared from 19.4 g NaCl in 300.0 mL of solution?

1.11 M NaCl

What is the molality of a solution prepared from 12.5 g KNO3 and 75.0 g H2O?

1.65 m KNO3

What is the molarity of a solution containing 4.2 moles of NaCl and a volume of 2.3 L?

1.8 M NaCl

What is the molarity of a solution prepared from 15.0 grams KNO3 in 75.0 mL solution?

1.97 M KNO3

What is the volume/volume percent of a solution prepared from 10.0 g ethanol in 95.0 g water? The density of ethanol is 0.789 g/mL and the density of water is 1.00 g/mL.

11.8% (v/v) ethanol

What is the volume/volume percent of a solution prepared from 19.5 mL methanol in 125 mL ethanol? Assume volumes are additive.

13.5% (v/v) methanol in ethanol

What is the mass percent of a solution prepared from 20.0 g KNO3 and 125.0 g water?

13.8% (m/m) KNO3

What is the mass/volume percent of a solution prepared from 35.0 g AgNO3 in 225 g solution? The density of the solution is 1.00 g/mL.

15.6% (m/v) AgNO3

What is the mass/volume percent of a solution prepared from 19.5 g NaOH in 125 g solution? The density of the solution is 1.05 g/mL.

16.4% (m/v) NaOH

What is the mass percent of a solution prepared from 15.0 g NaCl and 75.0 g H2O?

16.7% (m/m) NaCl

What is the volume percent (v/v) of a solution containing 25 mL of isopropyl alcohol, C3H7OH, dissolved in enough water to make a 150 mL solution?

17% (v/v) C3H7OH

What is the mass percent of a solution prepared from 17.5 g MgCl2 in 85.0 g H2O?

17.1% (m/m) MgCl2

What is the mass/volume (m/v) percent of a solution containing 45 g of lithium hydroxide, LiOH, dissolved in enough water to make a 250 mL solution?

18% (m/v) LiOH

What is the molarity of a solution prepared from 85.0 g CaCl2 in 300.0 g of solution? The density of the solution is 1.05 g/mL.

2.68 M CaCl2

What is the mass/volume percent of a solution prepared from 15.0 g NaCl in 75.0 g solution? The density of the solution is 1.00 g/mL.

20.0% (m/v) NaCl