Molality Quiz 2

Created by

Kamran Fateh

Solution Chemistry

Molality Quiz 2

"Molality remains constant with temperature changes, unlike molarity, making it ideal for studying colligative properties such as boiling point elevation and freezing point depression. Higher molality increases these effects, as colligative properties depend on the number of solute particles, not the type of solute."

1 / 8

If a solution contains 0.5 mol of urea in 250 g of water, what is its molality?

1) 0.5 m

2) 1 m

3) 2 m

4) 3 m

2 / 8

Which concentration unit is suitable for reactions under varying temperatures?

1) Molarity

2) Molality

3) Normality

4) Mole fraction

3 / 8

To prepare a 0.5 m solution of NaCl, 0.5 mol of NaCl is added to:

1) 1 kg of NaCl

2) 500 g of water

3) 1 kg of water

4) 500 mL of water

4 / 8

If molality of a solution increases, what effect does it have on its boiling point?

1) Increases

2) Decrease

3) Remains constant

4) None

5 / 8

Which of the following has the highest molality?

1) 1 mol NaCl in 500 g water

2) 1 mol NaCl in 1 kg water

3) 1 mol NaCl in 1.5 kg water

4) 1 mol NaCl in 2 kg water

6 / 8

If the molality of a solution doubles, the depression in freezing point will:

1) Double

2) Halve

3) Triple

4) Remain the same

7 / 8

Which of the following is incorrect regarding molality?

1) It is used in colligative property calculations

2) It changes with temperature

3) It is preferred over molarity for precise measurements

4) It is independent of temperature

8 / 8

If you dissolve 1 mol of KCl in 1 kg of ethanol instead of water, how does this affect molality compared to dissolving in water?

1) Increases due to ethanol's lower density

2) Decreases due to ethanol's lower density

3) Stays the same

4) Increases due to ethanol's larger molar mass

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