1. A reaction is being studied that has the following general form and correspon
ID: 513726 • Letter: 1
Question
1. A reaction is being studied that has the following general form and corresponding rate law:
A + B C + D; rate = k[A][B]2
Given this information, which of the following statements is true?
A. The orders of the reactants are determined simply by looking at the reaction coefficients.
B. The order of the reaction with respect to A is 0.
C. The overall order of the reaction is 2.
D. If the concentration of A were doubled, the rate of the reaction would be doubled as well.
2. Say that in today's experiment you are given a 250 mL flask to which you add 10.00 mL of 0.447 M Fe3+ solution, 10.00 mL of 0.15 M HNO3 and 20.00 mL of distilled water. What is the molar concentration of the Fe3+in the final mixture?
A. The orders of the reactants are determined simply by looking at the reaction coefficients.
B. The order of the reaction with respect to A is 0.
C. The overall order of the reaction is 2.
D. If the concentration of A were doubled, the rate of the reaction would be doubled as well.
2. Say that in today's experiment you are given a 250 mL flask to which you add 10.00 mL of 0.447 M Fe3+ solution, 10.00 mL of 0.15 M HNO3 and 20.00 mL of distilled water. What is the molar concentration of the Fe3+in the final mixture?
Explanation / Answer
1) Order of a reaction is a experimentally determined quantity known from the exponents in the rate law epression and nothing to do with the balanced chemical equation. As given in the rate law expression, Rate = k[A][B]2 , the order w.r.t. A is 1 and that of B is 2 and overall order of the reaction = 2+1= 3 (third order). Since the order of the reaction w.r.t. A is 1, If the concentration of A were doubled, the rate of the reaction would be doubled as well.
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