A gaseous mixture has the following composition in mol%: N2 (22%), Cl2 (28%), H2 (35%) and CH4 (15%). There are 12 kg of this mixture at a pressure of 6 atm and a temperature of 25 C; said mixture is sent to a reactor where the transformation takes place: H2+Cl22HCl This reaction has a yield of 80% and the gases leave the reactor at 7 atm and 35 C. Determine: a) The average molecular weight of the gas mixture at the inlet and outlet of the reactor. b) The volume of gaseous mixture leaving the reactor. c) The composition of the gaseous mixture in % weight at the end of the reaction.