Given the reaction: 2X(g) + Y(g) → 22(g) When the concentration of substance Y in this reaction is doubled,
all other factors being held constant, it is found that the rate of the

reaction remains unchanged. The most probable explanation for this
observation is that
A) substance y is a catalyst and as such it affects the rate of the reaction does not depend on it concentration
b) substance y is not involved on any of the steps in mechanism of the reaction
c)the order of the reaction respect to y is 1
d) substance y is not involved in the rate determine step of the mechanism but is involved in subsequent steps