Question

1. What is the overall reaction order for the reaction that has the rate law: Rate = k[H₂] [NO]² ?

a.         zero order

b.         first order

c.          second order

d.         third order

2. The first-order decomposition of hydrogen peroxide occurs according to the equation

2 H₂O₂(aq) ? 2 H₂O(l) + O₂(g)

Using data from a concentration-time study of this reaction, which plot will produce a straight line?

a.         1/[H₂O₂] versus time

b.         ln[H₂O₂] versus time

c.          [H₂O₂]² versus time

d.         [H₂O₂] versus time

3. For the zeroth-order reaction: C ? products, -?[C]/?t = k, which of the following graphs would be expected to give a straight line?

a. 1/[C] vs. t

b. [C]² vs. t

c. [C] vs. t

d. ln[C] vs. t

Answer 1

to get order for a reaction use following steps

1. write down rate law
Rate = k[H2] [NO]2

2. add powers of each reactant given in the rate law
here : H2 has power 1 and NO has power 2
so their sum = 1+2 =3
Thus order of reaction = 3

Answer :d. third order
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2
graph of

[H2O2] versus time indicate reaction is 0 order
ln[H2O2] versus time indicate reaction is 1 st order

1/[H2O2] versus time indicate reaction is 2nd order
[H2O2]2 versus time indicate reaction is 3 order

It is given that reaction is first order .

hence answer is :b. ln[H2O2] versus time
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3.
for zero order graph of reactant concentration Vs time is a straight line

Hence answer is
c. [C] vs. t
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Thanks !