Answer:
1) The molality is 0.145 molal
2) We need 0.50 kg water
3) The molality is 0.245 molal
Explanation:
What is the molality of a solution in which 0.32 moles AlCl3 has been dissolved in 2,200 g water?
Molality = moles AlCl3 / mass water (in kg)
Molality = 0.32 moles / 2.2 kg water
Molality = 0.145 moles/kg = 0.145 molal
The molality is 0.145 molal
What mass of water is needed to prepare a 1.20 molal solution using 0.60 mol propyleneglycol?
Molality = moles propyleneglycol / mass water
1.20 = 0.60 / x kg
X = 0.60 / 1.2
X = 0.50 kg water
We need 0.50 kg water
What is the molality of a solution in which 0.145 mol CO2 is dissolved in 591 g water?
Molality = moles CO2 / mass water (in kg)
Molality = 0.145 moles / 0.591 kg
Molality = 0.245 molal
The molality is 0.245 molal
