Chemistry Homework Help

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Molality

#### Q. 0.1 M solution of NaOH has a density of 1.01g /mL. 1 L of this solution is evaporated to make it 0.8L and both molarity and molality of the of the solution will increase. Which one will show a greater increase, molarity or molality? Explain.

Solved • Apr 7, 2020

Molality

#### Q. Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d = 0.792 g/mL) and 387 mL of CH3CH2CH2OH (d = 0.811 g/mL). 1.57 m 4.98 m 2.01 m 0.82 m

Solved • Mar 28, 2020

Molality

#### Q. A 2.750x10^-2 M solution of glycerol (C3H8O3) in water is at 20.0 °C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of the water needed to do this was 998.8 mL. The density of water at 20.0 °C is 0.9982 g/mL. Calculate the molality of the glycerol solution.

Solved • Feb 24, 2020

Molality

#### Q. What is the molality of NaCl in a solution that is 5.000 M NaCl, with a density of 1.31 g mL-1

Solved • Feb 13, 2020

Molality

#### Q. The density of toluene (C7H8) is 0.867 g.mL, and the density of thiophene (C4H4S) is 0.065 g/mL. A solution is made by dissolving 8.10 g of thiophene in 270 mL of toluene. Calculate the molality of thiophene in the solution.

Solved • Feb 7, 2020

Molality

#### Q. A 2.650x10^-2 M solution of glycerol (C3H8O3) in water is at 20.0°C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 998.9 mL. The density of water at 20.0°C is .09982 g/mL. Calculate the molality of the glycerol solution. Express your answer to four significant figures and include the appropriate units.

Solved • Feb 7, 2020

Molality

#### Q. A solution was prepared by dissolving 31.0 g of KCl in 225 g of water. Calculate the molality of KCl in the solution. Express your answer with the appropriate units.

Solved • Feb 7, 2020