Question

A first-order reaction is found to have a rate constant, k = 5.5 × 10^-14 s^-1. The time taken for completion of the reaction is:

Options

• 1.26 × 10¹³ s

• 2.52 × 10¹³ s

• 0.63 × 10¹³ s

• It never goes to completion.

Answer 1

It never goes to completion.

Explanation:

First-order reaction [R] is [R₀] e^-kt. If [R] = 0, then e^-kt = 0, which is not possible for any finite value of t. Here, t is ∞.