Question

For the zero order reaction A => B+C initial concentration of A is 0.1M. If {A}= 0.08M after 10minutes then it's half life and completion time are?

Answer 1

Answer:

The half life of the sample is 25 min.

Time taken by the reaction get complete: 25 min × 2 = 50 min.

Explanation:

Initial concentration $[A_o$]= 0.1 M

Concentration at time ,t = 10 minutes :[A]= 0.8 M

Equation of Zero order reaction;

$k=\frac{1}{t}([A_o]-[A])$

$k=\frac{1}{10 min}[[0.1M-0.08M]]=0.002 mol/L min$

The half of the sample is given by:

$t_{\frac{1}{2}}=\frac{[A]_o}{2k}=\frac{0.1M}{2\times 0.002}=25 min$

The half life of the sample is 25 min.

Time taken by the reaction get complete: 25 min × 2 = 50 min.