---
title: "A student investigates the thermal decomposition of nitryl chloride, \\(\\text{NO}_2\\text{Cl(g)}\\). The first step of the proposed reaction mechanism is a unimolecular elementary step:  \\(\\text{NO}_2\\text{Cl(g)} \\rightarrow \\text{NO}_2\\text{(g)} + \\text{Cl(g)}\\)  Which of the following is the correct rate law expression for this elementary step?"
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url: "https://nerd-notes.com/ubq/119280/"
date_modified: "2026-08-19T12:39:38+00:00"
---

# A student investigates the thermal decomposition of nitryl chloride, \(\text{NO}_2\text{Cl(g)}\). The first step of the proposed reaction mechanism is a unimolecular elementary step:

\(\text{NO}_2\text{Cl(g)} \rightarrow \text{NO}_2\text{(g)} + \text{Cl(g)}\)

Which of the following is the correct rate law expression for this elementary step?

A student investigates the thermal decomposition of nitryl chloride, \(\text{NO}_2\text{Cl(g)}\). The first step of the proposed reaction mechanism is a unimolecular elementary step:

\(\text{NO}_2\text{Cl(g)} \rightarrow \text{NO}_2\text{(g)} + \text{Cl(g)}\)

Which of the following is the correct rate law expression for this elementary step?

- **A.** \(\text{Rate} = k [\text{NO}_2\text{Cl}]^2\)
- **B.** \(\text{Rate} = k [\text{NO}_2][\text{Cl}]\)
- **C.** \(\text{Rate} = k [\text{NO}_2\text{Cl}]\)
- **D.** \(\text{Rate} = k \dfrac{[\text{NO}_2][\text{Cl}]}{[\text{NO}_2\text{Cl}]}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119280/*