Question

In a 1st order reac. A-> products the conc. Of reactant decreases to 6.25% of its initial value in 80 min. What is 1) the k 2)R,100minafter the start if the initial conc. Is 0.2 mole/litre

Answer 1

a)
Let the initial concentration be
For first order reaction

Here,
R = 6.25

k=0.0288 log
k=0.03466
b)

0.03466 =
1.50499

4.09098
R = 0.04888