22. (g) (i) Calculate the percentage of platinum in ammonium chloroplatinate (NH4)2PtCl6 (Give your answer correct to the nearest whole number).   23. (ii) The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9% Phosphorus and 39% oxygen. Find the empirical formula of the compound (work to upto two decimal places). (H = 1, N = 14, O = 16, Na = 23, P = 31, Cl = 35.5, Pt = 195)