Question

A reaction which is first order with respect to reactant 'A' has a rate constant of 6min . If we start with [A]=0.5mol/l when will [A] reach the value of 0.05 mol/l​

Answer 1

ANSWER

For a first order reaction

rate constant k is given by

$K \: = \: \frac{2.303 \: }{t} \: \times log_{10}( \frac{a}{a - x} )$

where a = initial concentration

a-x = concentration at time t

here

a = 0.5 mol/l

a-x = 0.05 mol/l

t = 6 min

On putting values

$K \: = 0.38 \: min$