Task

A closed 2 L vessel was charged with 0.6 mol of nitrogen and 1.8 mol of hydrogen and heated with a catalyst: N₂ + 3H₂ ⇌ 2NH₃. At equilibrium the total amount of gas had decreased by 20 % compared with the initial amount (constant temperature). 1) Find the amount (mol) and molar concentration of each gas at equilibrium. 2) Calculate the equilibrium constant Kc. 3) Find the degree of conversion of nitrogen into ammonia (%). 4) Calculate the mean molar mass of the equilibrium mixture and its density relative to helium. For every part, show the method (reaction equations, formulas, reasoning) and all calculations step by step.