a) 3 moles of substance in 2 dm3 of water.
b) 0.2 moles of substance in 0.5 dm3 of water.
c) 1.4 moles of substance in 0.2 dm3 of water.
a) 1.5 mol/dm3
b) 0.4 mol/dm3
c) 7 mol/dm3