The balanced equation for the reaction of chromium metal and chlorine gas is 2Cr(s) + 3Cl2(g) → 2CrCl3(s) What is the limiting reactant when each of the following sets of quantities of reactants is mixed? (a) 4 Cr atoms and 6 Cl2 molecules (b) 6 Cr atoms and 10 Cl2 molecules (c) 12 Cr atoms and 20 Cl2 molecules