Question

calculate the rate constant for the 60% completion of first order reaction if 80% is completed in 20 min​

Answer 1

Answer:

it's easier to use a handy formula: rate equals distance divided by time: r = d/t. Actually, this formula comes directly from the proportion calculation -- it's just that one multiplication step has already been done for you, so it's a shortcut to learn the formula

Explanation:

Given that the rate constant for a first order reaction is 60 s

−1

.

Let a M be the initial concentration.

Final concentration will be  

16

a

​

 M.

Rate constant, k=60/s

t=

k

2.303

​

log(

[A]

[A]

0

​

​

)

t=

60

2.303

​

log

⎝

⎛

​

 

16

a

​

a

​

 

⎠

⎞

​

t=4.6×10

−2

 seconds