Chapter 6, Problem 34QP

The balanced equation for the reaction of chromium metal and chlorine gas is

$\text{2Cr}(s)+{\text{3Cl}}_{\text{2}}(g)\to {\text{2CrCl}}_{\text{3}}(s)$

What is the limiting reactant when each of the following sets of quantities of reactants is mixed?

(a) 4 Cr atoms and 6 ${\text{Cl}}_{\text{2}}$ molecules

(b) 6 Cr atoms and 10 ${\text{Cl}}_{\text{2}}$ molecules

(c) 12 Cr atoms and 20 ${\text{Cl}}_{\text{2}}$ molecules