---
title: "A gas mixture is prepared in a rigid container at a temperature at which the reaction  \\(\\text{X}_2\\text{(g)}+\\text{Y}_2\\text{(g)}\\rightleftharpoons 2\\text{XY(g)}\\)  has \\(K_p=2.0\\). The total pressure of the mixture is \\(8.0\\text{ atm}\\), and each molecule pictured in the diagram represents the same number of actual molecules.  Which choice correctly gives the reaction quotient, \\(Q_p\\), for the mixture and predicts the direction of the net reaction?"
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url: "https://nerd-notes.com/ubq/119423/"
date_modified: "2026-08-19T12:40:15+00:00"
---

# A gas mixture is prepared in a rigid container at a temperature at which the reaction

\(\text{X}_2\text{(g)}+\text{Y}_2\text{(g)}\rightleftharpoons 2\text{XY(g)}\)

has \(K_p=2.0\). The total pressure of the mixture is \(8.0\text{ atm}\), and each molecule pictured in the diagram represents the same number of actual molecules.

Which choice correctly gives the reaction quotient, \(Q_p\), for the mixture and predicts the direction of the net reaction?

A gas mixture is prepared in a rigid container at a temperature at which the reaction

\(\text{X}_2\text{(g)}+\text{Y}_2\text{(g)}\rightleftharpoons 2\text{XY(g)}\)

has \(K_p=2.0\). The total pressure of the mixture is \(8.0\text{ atm}\), and each molecule pictured in the diagram represents the same number of actual molecules.

Which choice correctly gives the reaction quotient, \(Q_p\), for the mixture and predicts the direction of the net reaction?

![Draw a wide rectangular container with a thin black outline. Place a legend above the container that maps two joined open white circles to one \(\text{X}_2\) molecule, two joined solid black circles to one \(\text{Y}_2\) molecule, and one joined open white circle and solid black circle to one \(\text{XY}\) molecule. Use equal-sized circles and a short single line for each bond. Inside the container, arrange exactly eight molecules in two evenly spaced rows of four. Top row, left to right: open-open pair, solid-solid pair, open-solid pair, open-open pair. Bottom row, left to right: solid-solid pair, open-open pair, open-solid pair, open-open pair. Keep all molecules separated and entirely within the container. No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787143214-nv2tqB.jpg)

- **A.** \(Q_p=0.25\); the net reaction proceeds to the right.
- **B.** \(Q_p=0.50\); the net reaction proceeds to the right.
- **C.** \(Q_p=2.0\); the mixture is at equilibrium.
- **D.** \(Q_p=4.0\); the net reaction proceeds to the left.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119423/*