General Chemistry
General Chemistry
4th Edition
ISBN: 9781891389603
Author: Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly
Publisher: University Science Books
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Chapter 18, Problem 18.50P

(a)

Interpretation Introduction

Interpretation:

The effect of increasing the concentration of NO(g) on the rate constant and the overall reaction rate has to be determined.  The rate law for the reaction is given below.

  2NO(g)+O2(g)2NO2(g)Rateofreaction=k[NO]2[O2]

Concept Introduction:

Rate law or rate equation: The relationship between the reactant concentrations and reaction rate is expressed by an equation.

  aA + bBxXRate of reaction = k [A]m[B]nTotalorderof reaction = (m + n).

Order of a reaction: The order of a reaction with respect to a particular reactant is the exponent of its concentration term in the rate law expression, and the overall reaction order is the sum of the exponents on all concentration terms.

Rate constant, k: It is a proportionality constant that relates rate and concentration at a given temperature.

(b)

Interpretation Introduction

Interpretation:

The effect of adding a catalyst on the rate constant and the overall reaction rate has to be determined.  The rate law for the reaction is given below.

  2NO(g)+O2(g)2NO2(g)Rateofreaction=k[NO]2[O2]

Concept Introduction:

Properties of catalysts:

Catalysts provide a lower energy pathway by decreasing activation energy.  They are not consumed by the reaction.  They do not change the final amounts of reactants and products produced.

(c)

Interpretation Introduction

Interpretation:

The effect of decreasing the concentration O2(g) on the rate constant and the overall reaction rate has to be determined.  The rate law for the reaction is given below.

  2NO(g)+O2(g)2NO2(g)Rateofreaction=k[NO]2[O2]

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The effect of decreasing the temperature on the rate constant and the overall reaction rate has to be determined.  The rate law for the reaction is given below.

  2NO(g)+O2(g)2NO2(g)Rateofreaction=k[NO]2[O2]

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