The First-Order Reaction A $\rightarrow$ B, Has K = 5

question 21

Multiple Choice

The first-order reaction A $\rightarrow$ B, has k = 5.67 s^-1. If [A]₀ = 0.500 M, how long will it take to reach [A] = 0.124 M?

• A) 0.122 s
• B) 0.100 s
• C) 8.18 s
• D) 0.246 s
• E) 0.488 s

---

Definitions:

Contract

A binding contract between multiple parties that is supported by legal enforcement.

Principal Purpose

The primary or predominant reason for which an activity, agreement, or operation is intended or carried out.

Substantially Frustrated

A condition in contract law when an unforeseen event undermines the purpose of the contract, justifying its termination.

Basic Assumption

A fundamental belief or principle that is accepted as true without proof.