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A reaction, A ⭢ is performed in a lab and the concentration of the reactant A i…
Related Topics
Wize University Chemistry Textbook > Kinetics
Half-lives for Various Orders
3 Activities
A reaction, A
→
\rightarrow
→
is performed in a lab and the concentration of the reactant A is plotted as a function of time.
What is the half life?
12
5
0.08
7
It cannot be determined from the graph.
I don't know
Check Submission
More Half-lives for Various Orders Questions:
The Rate Law: Half Life
What is the half‐life of a reaction that has k = 0.254 M/s and [A]
0
of 0.254 M.
The Rate Law: Half life
Given a second order reaction, derive the expression for the half life:
The integrated rate law for the second order reaction is:
1
[
A
]
t
=
k
t
+
1
[
A
]
0
\frac{1}{\left[A\right]_t}=kt\ +\frac{1}{\left[A\right]_0}
[
A
]
t
1
=
k
t
+
[
A
]
0
1
A first order gas phase reaction N
2
O
4
→ 2 NO
2
was carried out isothermally and the activation barrier was found to be 23.5 kJ/mol. Initially p(N
2
O
4
) = 2.6 atm and p(NO
2
) = 0. After 1 hour p(NO
2
) = 2.0 atm and p(N
2
O
4
) =1.6 atm. Assume that both NO
2
and N
2
O
4
are ideal gases.
Determine the first order rate constant k, and the half life t
1/2
.
The above reaction was performed at 220
o
C. Calculate the pre-exponential factor.
Practice: Using Integrated Rate Laws
Americium-241 is a synthetic isotope made in nuclear reactors around the world. Chances are you have been in close proximity to this radioactive isotope thousands of times in your life because it is used in household smoke detectors.
241
Am is an alpha emitter whose decay obeys a first order rate-law (as do all nuclear decays) with a half-life of 432.6 years.
