For the reaction between nitrogen monoxide and chlorine to produce nitrosyl chloride, 2NO(g) + Cl2(g) à 2NOCl(g), it is found that tripling the initial concentration of both reactants increases the initial rate by a factor of 27. If only the initial concentration of chlorine is tripled, the initial rate increases by a factor of 3. What is the order of the reaction with respect to Cl2?
A) ½
B) 0
C) 3
D) 1
E) 2
