---
title: "A sample of pure gas \\(\\text{X}\\) is placed into a previously evacuated, rigid container at a constant temperature. The graph below shows the concentrations of \\(\\text{X(g)}\\), \\(\\text{Y(g)}\\), and \\(\\text{Z(g)}\\) over time as the system approaches chemical equilibrium.  Based on the data in the graph, which of the following balanced chemical equations best represents the reaction?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/119821/"
date_modified: "2026-08-21T08:12:28+00:00"
---

# A sample of pure gas \(\text{X}\) is placed into a previously evacuated, rigid container at a constant temperature. The graph below shows the concentrations of \(\text{X(g)}\), \(\text{Y(g)}\), and \(\text{Z(g)}\) over time as the system approaches chemical equilibrium.

Based on the data in the graph, which of the following balanced chemical equations best represents the reaction?

A sample of pure gas \(\text{X}\) is placed into a previously evacuated, rigid container at a constant temperature. The graph below shows the concentrations of \(\text{X(g)}\), \(\text{Y(g)}\), and \(\text{Z(g)}\) over time as the system approaches chemical equilibrium.

Based on the data in the graph, which of the following balanced chemical equations best represents the reaction?

![A line graph with a horizontal axis labeled Time (min) ranging from 0 to 10 with tick marks every 2 units, and a vertical axis labeled Concentration (M) ranging from 0.00 to 1.20 with horizontal gridlines and tick marks at intervals of 0.20. Three distinct grayscale curves are plotted. A solid black curve representing X starts at (0, 1.00), decreases smoothly, and flattens horizontally at (6, 0.60) through (10, 0.60). A dashed curve representing Y starts at (0, 0.00), increases smoothly, and flattens horizontally at (6, 0.60) through (10, 0.60). A dotted curve representing Z starts at (0, 0.00), increases smoothly, and flattens horizontally at (6, 0.20) through (10, 0.20). A legend in the upper right indicates: solid line = X, dashed line = Y, dotted line = Z. No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787299948-JMtJ9H.jpg)

- **A.** \(3\,\text{X(g)} \rightleftharpoons 3\,\text{Y(g)} + \text{Z(g)}\)
- **B.** \(2\,\text{X(g)} \rightleftharpoons 3\,\text{Y(g)} + \text{Z(g)}\)
- **C.** \(2\,\text{X(g)} \rightleftharpoons \text{Y(g)} + 3\,\text{Z(g)}\)
- **D.** \(5\,\text{X(g)} \rightleftharpoons 3\,\text{Y(g)} + \text{Z(g)}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119821/*