While 2.0 mol of carbon disulfide as well as 4.0 mol of chlorine are placed in a 1.0 L flask the subsequent equilibrium system results:
CS2(g) + Cl2(g) ↔ S2Cl2 (g) + CCl4(g)
At equilibrium the flask is found to contain 0.30 mol of carbon tetrachloride. Explain what is the amount of chlorine at equilibrium?