Posted by Rachel on Friday, December 2, 2011 at 3:55pm.
C2H6 > 2CH3
at a temperature where the halflife is 21 minutes.
If the initial concentration is 8.0 mM, what would the concentration be after 46.0 minutes?
How long would it take to convert 95% of C2H6 at this temperature?

Chemistry  DrBob222, Friday, December 2, 2011 at 6:31pm
Fist, solve for k.
k = 0.693/t_{1/2}.
The b part of the question is solved with the following.
Set No = 8.0 mM
Solve for N. Units will be in mM.
Substitute k from the first part.
ln(No/N) = kt
For c part.
Use the same equation as part b but us No = 100
N = 5
k form part a
Solve for t.
Post your work if you get stuck.
Answer This Question
Related Questions
 Chemistry  I've tried this problem over and over again, but im not getting the ...
 Chemistry  The following reaction is first order, C2H6==> 2CH3. If the rate ...
 chemistry  How long would it take for the concentration of the reactant to drop...
 chemistry  The initial concentration of the a substance was 1.95 M. After 27.72...
 Chemistry  In the dehydrogenation of ethane two reactions take place: C2H6 =>...
 chemistry  If there are 80 milligrams of a radioactive element decays to 10 ...
 Chemistry  a compound decomposes with half life of 8seconds and is independent ...
 chemistry  What would be the concentration of dinitrogen pentoxide after 6.00 X...
 science  If the halflife of a 20.0g is known to be 24 minutes, how long will ...
 Ap Chemistry  Hi, I was wondering if you could possibly help me with this chem ...
More Related Questions