Molality Worksheet 13



Molality Worksheet

Complete the following questions and problems relating to molality.

1) Write the equation for molality:

M= moles solute/ kg of solvent

2) Write the equation for molarity:

M=moles solute/ L of solution

3) Explain in words how molality and molarity differ.

M=moles/L of solution (total volume)

M=moles/kg of solvent

4) What is the molality of a solution in which 0.32 moles AlCl3 has been dissolved in 2,200 g water?

0.15m

5) What mass of water is needed to prepare a 1.20 molal solution using 0.60 mol propyleneglycol?

0.500kg H2O

6) What is the molality of a solution in which 0.145 mol CO2 (molar mass = 44.01

g/mol) is dissolved in 591 g water?

0.25m

7) What is the molality of a solution in which 13.7 g NaCl has been dissolved in

500.0g water?

0.47m

8) How many grams of ethanol, C2H6O (molar mass 46.08 g/mol), are need to prepare a 0.10 molal solution using 1.000 kg water.

4.61g

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