1. Calculate the theoretical yield percentage for the following cases:
a) 55kg of Cl2 are produced from the decomposition of 150 kg of aluminium chloride.
AlCl3 à Al + Cl2 (unbalanced equation)
2AlCl3 = 2 Al +Cl2
150kg= 150000
Number of moles of AlCl3 = 150000/133.34g/mol = 1124.94
Number of moles of Cl2 =71g/mol
b) 255 kg of silicon are produced during the reaction of 1.0 t of carbon with excess quartz, SiO2.
SiO2 + C à Si + CO (unbalanced equation)
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 + Cl2 à SiCl4 (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.