Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

Many reactions involving heterogeneous catalysts are zero order; that is, rate $=k .$ An example is the decomposition of phosphine $\left(\mathrm{PH}_{3}\right)$ over tungsten $(\mathrm{W}):$$$4 \mathrm{PH}_{3}(g) \longrightarrow \mathrm{P}_{4}(g)+6 \mathrm{H}_{2}(g)$$It is found that the reaction is independent of $\left[\mathrm{PH}_{3}\right]$ as long as phosphine's pressure is sufficiently high $(\geq 1$ atm). Explain.

Get the answer to your homework problem.

Try Numerade free for 7 days

Input your name and email to request the answer

Like

Report

In heterogeneous catalysis, the $\mathrm{PH}_{3}$ must first adsorb to the surface of the solid tungsten (active surface). At sufficient pressure of $\left[\mathrm{PH}_{3}\right],$ all the active surface of the tungsten is occupied by phosphine. Thus, even if you increase the concentration of $\left[\mathrm{PH}_{3}\right],$ the reaction on the surface still depends on the accessible surface area. As a result, the rate becomes independent of $\left[\mathrm{PH}_{3}\right]$

Chemistry 102

Chapter 6

Chemical Kinetics

Kinetics

Brown University

University of Toronto

Lectures

22:42

In probability theory, the conditional probability of an event A given that another event B has occurred is defined as the probability of A given B, written as P(A|B). It is a function of the probability of B, the probability of A given B, and the probability of B.

04:55

In chemistry, kinetics is the study of the rates of chemical reactions. The rate of a reaction is the change in concentration of a reactant over time. The rate of reaction is dependent on the concentration of the reactants, temperature, and the activation energy of the reaction.

00:35

Many reactions involving h…

01:32

00:58

7. A number of reactions t…

03:32

A number of reactions that…

03:40

The decomposition of many …

01:22

05:09

The kinetics of the decomp…

01:43

A reaction has two reactan…

08:32

03:37

Certain gas-phase reaction…

01:46

Which of these reactions a…

01:54

No transcript available

View More Answers From This Book

Find Another Textbook

Numerade Educator

01:44

Consider atoms of the following elements. Assume that the atoms are in the g…

07:59

Explain why NH3 has stronger intermolecular forces of attraction than Cl2

01:28

(5.625 + 8.15) x 2.34 + 3.2

02:03

explain the relationship between plate tectonics and volcanos

01:45

Which of these expressions are correct variations of the Combined Gas Law?

01:18

1) Given the balance equation below. Calculate how much Na3PO4 in grams youw…

07:55

Which of the following statements about the effective nuclear charge (Zeff) …

02:01

Draw the correct Lewis structure for NH3.

01:36

Help please!!2NaCl + MgO ---> Na20 + MgCl2If 84 grams of so…

01:00

Write a net ionic equation for the reaction of hydrochloric acid with ammoni…