Question

for an elementary reaction, X(g)-> Y(g) + Z(g) the half tife period is 10 min. In what period of time
concentration of X will be reduced to 10% of original concentration?
(1) 20 min
(4) 25 min
(2) 33 min
(3) 15 min





First tell me, why this is relate to first order reaction?????????? ​

Answer 1

Answer:

Given, t

2

1

=10min

For elementary reaction X

(g)

⟶Y

(g)

+Z

(g)

A=A

0

e

−kt

⟶(i) Where A

0

is initial concentration, while A concentration at time t.

Since, K=

t

112

0.693

=

10

0.693

=0.0693

From equation (i), we have

0.1A

0

=A

0

e

−0.0693×t

In 0.1=−0.0693×t

−2.303=−0.0693t

t=33.23min.≈33min