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Unformatted text preview:6 g = 1200Kg 255 x 100 / 1200 = 21.25 The theoretical yield percentage is 21.25% 2. In the first step of silicon purification, a reaction is brought about between the impure silicon and chlorine. Pure silicon is then used, in the computer industry, for the manufacture of microchips. Si + Cl 2 SiCl 4 (unbalanced equation) Given that the silicon is 92% pure, calculate the theoretical yield percentage if 1.0 t of impure silicon produces 2.33 t of silicon (IV) chloride. (6 marks) Si + 2Cl 2 = SiCl 4 1mol. 4mol. 1mol. 1 Si: 28.09 Cl: 35.45 2.33 x 10 6 / 169.89g/mol. (28.09g/mol. + 4 x 35.45g/mol.) = 1.4 x 10 3 x ¼ (ratio Si in SiCl 4 ) = 3.5 x 10 2 Kg x 0.92 = 3.22 x 10 2 Kg 3.22 x 10 2 Kg / 2.33 x 10 3 = 0.14 The theoretical yield percentage is 14% 2