An analytical chemist determines that a waste runoff sample contains sodium carbonate, Na2CO3\text{Na}_2\text{CO}_3Na2CO3, at a concentration of 18.55 g dm-3.
Calculate the concentration of this sodium carbonate solution in mol dm−3\text{mol dm}^{-3}mol dm−3.
(Relative formula mass, MrM_rMr: Na2CO3=106\text{Na}_2\text{CO}_3 = 106Na2CO3=106)