試題詳解

18. What is the volume, in cm³ , of the final solution if 100 cm³ of a solution containing 1.42 g of sodium sulfate, Na₂SO₄, is diluted to the concentration of 0.020 mol dm^–3? Mr(Na₂SO₄) = 142
(A) 50
(B) 400
(C) 500
(D) 600