- By Ideal gas law, PU=nRT n = 1.749m x 0.220L 0.0821 Lamm x (158+273) K nolk & n= 0.0108 mol cl Now, by ran Brzlg) + Cl2(g) 2 Brcleg) Here, Imole Cla produce = 2 mol Brce 0.0108 mol Cla produce = (2x 0.0108) mol Bull 1 = 0.0216 mol Brce Again, by Ideal gas law, PU= nRT P x 2.872 = 0.0216 mol x 0.0821m x(39+273)K * P=10.193 atm