Saturday

March 28, 2015

March 28, 2015

Posted by **Rachel** on Friday, December 2, 2011 at 3:55pm.

at a temperature where the half-life 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 6:31pmFist, 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 - 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 - If there are 80 milligrams of a radioactive element decays to 10 ...

Chemistry - a compound decomposes with half life of 8seconds and is independent ...

science - If the half-life of a 20.0g is known to be 24 minutes, how long will ...

chemistry - What would be the concentration of dinitrogen pentoxide after 6.00 X...

Ap Chemistry - Hi, I was wondering if you could possibly help me with this chem ...

chemistry - In the presence of a tungsten catalyst at high temperature, the ...

Chemistry - What would be the concentration of dinitrogen pentoxide after 6.00 X...