Question

The reaction $A \rightarrow B$ follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?
(a) 2 hours
(b) 1 hour
(c) 0.5 hour
(d) 0.25 hour

Answer 1

${\huge {\mathfrak {Answer :-}}}$

➡️ In 1 hour, 0.8 - 0.6 = 0.2

So, let in x hour = 0.9 - 0.675 = 0.225

➡️ Now,

0.2 : 1 : : 0.225 : x

Or, x = 0.225 / 0.200

Or, x = 1. 125

Or, x = 1 (approx)

That's it...

Answer 2

Thanks for your question ✌

Option B is correct ✔✔