A Concentration-Time Study of the Gas Phase Reaction 2 A₃

question 12

Multiple Choice

A concentration-time study of the gas phase reaction 2 A₃ → 3 A₂ produced the data in the table below. Time (s) [A₃] (M) [A₂] (M)
0 4.00 × 10^-4 0
10 2.00 × 10^-4 3.00 × 10^-4
20 1.00 × 10^-4 4.50 × 10^-4
30 5.00 × 10^-5 ?
What is the average rate of decomposition of A₃ in the time interval 20-30 seconds?

• A)4.00 × 10^-4 M/s
• B)3.50 × 10^-5 M/s
• C)5.00 × 10^-6 M/s
• D)4.00 × 10^-6 M/s

---

Definitions:

Inconclusive

Describes results or data that do not clearly support a specific outcome, decision, or understanding, often indicating the need for further investigation.

Self-Enhancement

The tendency to focus on and exaggerate the positive aspects of oneself for a better self-image.

Habitual Behavior

Regular patterns of action that are repeated frequently and often performed subconsciously.

Conscious Decisions

Choices made with full awareness and deliberation, involving thoughtful consideration and an understanding of the consequences.