Chemistry
12th Edition
ISBN: 9780078021510
Author: Raymond Chang Dr., Kenneth Goldsby Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 13, Problem 13.56QP
For the reaction X2 + Y + Z → XY + XZ it is found that doubling the concentration of X2 doubles the reaction rate, tripling the concentration of Y triples the rate, and doubling the concentration of Z has no effect. (a) What is the rate law for this reaction? (b) Why is it that the change in the concentration of Z has no effect on the rate? (c) Suggest a mechanism for the reaction that is consistent with the rate law.
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(a) For a reaction A + B —> P, the rate is given by Rate = k[A]2 [B](i) How is the rate of reaction affected if the concentration of A is doubled?(ii) What is the overall order of reaction if B is present in large excess?(b) A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.(Given: log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
1. Which of the following statements is incorrect?
(A) As the chemical reaction proceeds, the rate of reaction increases.
(B) The reaction rate almost gets doubled for 10°C rise in temperature.
(C) For a first order chemical reaction, the rate constant has unit of time-1.
(D) Chemical kinetics can predict the rate of a chemical reaction.
2. In a chemical reaction, represented by A → P, it is observed that the rate of reaction increases by a
factor of 4 on doubling the concentration of the reactant. The rate of reaction increases by a factor of 9 on
trebling the concentration of the reactant. Then the rate of the reaction is proportional to
(A) CA
(B) CA2
(C) CA3
(D) CA4
3. An elementary reaction has the stoichiometric equation A + 2B = P. What is the order of reaction
(A) 0
(B) 1
(C) 2
(D) 3
4. It states that the rate of a chemical reaction is directly proportional to the product of the activities or
concentrations of the reactants.
(A) Law of mass action…
Consider the following reaction:
2 NO(g) + 2 H2(g) N2(g) + 2 H2O(g)
(a) The rate law for this reaction is second order in NO(g) and first-order in H2(g). What is the rate law for this reaction?
(b) If the rate constant for this reaction at a certain temperature is 9.70e+04, what is the reaction rate when [NO(g)] = 0.0560 M and [H2(g)] = 0.119 M?Rate = M/s.(c) What is the reaction rate when the concentration of NO(g) is doubled, to 0.112 M while the concentration of H2(g) is 0.119 M?Rate = M/s
Chapter 13 Solutions
Chemistry
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