Calculations involving the mole can be used to determine unknown concentrations, volumes and masses in reactions. One mole of any gas occupies 24 dm3 at room temperature and pressure.

What is 20 cm^{3} in dm^{3}?

0.002 dm^{3}

0.02 dm^{3}

0.2 dm^{3}

2.0 mol of solute is dissolved in 0.50 dm^{3} of water. What is the concentration of the solution formed in mol/dm^{3}?

0.25

1.0

4.0

What is the concentration of 0.100 mol/dm^{3} NaOH solution in g/dm^{3}? (Relative formula mass of NaOH = 40.0)

0.0025

4.00

400

What is 5000 cm^{3} in dm^{3}?

5.0 dm^{3}

0.5 dm^{3}

5,000,000 dm^{3}

0.5 mol of solute is dissolved in water to make 2 dm^{3} of solution. What is the concentration of the solution in mol/dm^{3}?

4 mol/dm^{3}

1 mol/dm^{3}

0.25 mol/dm^{3}

What is the concentration of 2.0 mol/dm^{3} of sodium chloride solution in g/dm^{3}? (Relative formula mass of NaCl = 58.5)

117 g/dm^{3}

29.25 g/dm^{3}

58.5 g/dm^{3}

A solution has a concentration of 8.0 g/cm^{3}. What mass of NaOH is in 5 dm^{3} of this solution? (Relative formula mass of NaOH = 40.0)

1.6 g

0.625 g

40 g

A solution of NaOH has a concentration of 4.0 g/dm^{3}. What mass of sodium hydroxide is in 0.250 dm^{3} of this solution? (Relative formula mass of NaOH = 40.0)

16 g

1.0 g

0.0625 g

0.01 dm^{3} of hydrochloric acid solution contains 0.01 mol of dissolved hydrogen chloride. What is the concentration of the acid in mol/dm^{3}

0.01 mol/dm^{3}

0.02 mol/dm^{3}

What volume of 2.0 mol/dm^{3} of sodium hydroxide solution contains exactly 1.0 mol of sodium hydroxide?

2.0 dm^{3}

3.0 dm^{3}