The reaction: 4A + 3B 1 2C + D is studied. Unknown masses of the reactants were mixed. After a reaction time of 1 hour the analysis of the mixture showed 2 kmol of A, 1 kmol of B and 4 kmol of C. Product D was present in the mixture but could not be analysed. 2.1. What is the mole fraction of D in the mixture? (7) 2.2. How many kilomoles A and B were initially charged? (3) 2.3. What is the limiting reactant and the % excess? (8) 2.4. What is the % conversion of the limiting reactant? (2)