Question

a first order reaction has a rate constant of 1.15. how long will 5g to become 3g

Answer 1

$t = 2.303log( \frac{cao}{ca} ) \div k$
cao = 5g ca = 3g
k = 1.15

On solving

t = 0.444 units

Answer 2

Answer:

It would take 444 seconds for 5g to become 3g.