Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
0 votes

It take 40min for concentration of reactant in first order to drop from 0.4M to 0.3M at $25^oC$.How long it will take for reaction to be 90% complete?

$\begin{array}{1 1}(a)\;330.15min\\(b)\;300.15min\\(c)\;310.15min\\(d)\;320.15min\end{array}$

Can you answer this question?

1 Answer

0 votes
For first order
$K\times t=ln \large\frac{a}{a-x}$
$K\times 40=ln\large\frac{0.4}{0.3}$
$K=\large\frac{1}{40}$$ln \large\frac{4}{3}$
$K\times t=ln\large\frac{1}{1-x/a}$
$\large\frac{1}{40}$$ln\large\frac{4}{3}$$t=ln 10$
answered Dec 18, 2013 by sreemathi.v
edited Jul 27, 2014 by balaji.thirumalai

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App