5.1 Define the term concentration. (2)
5.2 Eight (8) grams of Na2S2O3 is dissolved in water to prepare 500 cm3 of
solution. Calculate the concentration of the Na2S2O3 solution. (3)
5.3 A 10 g sample of a compound contains 2,66 g of potassium, 3,54 g of
chromium and 3,81 g of oxygen.
5.3.1 Define the term empirical formula. (2)
5.3.2 Determine the empirical formula of this compound. (7)
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