Question

A reaction is first order with respect to reactant X and second order with respect to reactant Y. Which statement describes the rate law for this reaction?
A) rate = k[X][Y]


B) rate = k[X]2[Y]


C) rate = k[X][Y]2


D) rate = k[X]2[Y]2


E) rate = k[Y]

Answer 1

Answer: The correct answer is Option C.

Explanation:

Rate law is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

Rate law expression for the reaction:

$\text{Rate}=k[X]^a[Y]^b$

where,

a = order with respect to X = 1

b = order with respect to Y = 2

Thus, the rate of the reaction becomes:

$\text{Rate}= k[X][Y]^2$

Hence, the correct answer is Option C.

Answer 2

C. rate k [x][y]2 should be the correct one