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?

Answer 1

From the question, we can write down the following information: Initial amount = 5 g
Final concentration = 3 g Rate constant = 1.15 10⁻³ s⁻¹

We know that for a 1st order reaction,