A first order reaction has a rate constant 1.15 × 10^-3 s^-1. How long will 5 g of this reactant take to reduce to 3 g?

Question

A first order reaction has a rate constant 1.15 × 10 -3 s -1 . How long will 5 g of this reactant take to reduce to 3 g?

Philoid · Accepted Answer

Given-

Rate constant, k = 1.15 × 10^-3 s^-1

Initial quantity, R₀ = 5 g

Final quantity, R = 3 g

According to the formula of first order reaction,

t =

t = 443.8 s

t = 4.438 × 10² s

The time taken for 5g of the reactant to reduce to 3 g is 4.438 × 10² s

A first order reaction has a rate constant 1.15 × 10-3 s-1. How long will 5 g of this reactant take to reduce to 3 g?