Reaction and Equilibrium Constant

Oct 13, 2025 by wbrum.org 15 views

Introduction

In this problem, we are given an empty steel container that is filled with $0.0400 \, \text{atm}$ of HF. The system is allowed to reach equilibrium, and we are asked to find the equilibrium partial pressure of $H_2$ given that $K_p = 2.76$ for the reaction below.

Reaction and Equilibrium Constant

The reaction is:

\text{HF}(g) \rightleftharpoons \text{H}_2(g) + \text{F}_2(g)

The equilibrium constant $K_p$ is given by:

K_p = \frac{P_{\text{H}_2}P_{\text{F}_2}}{P_{\text{HF}}}

Given Information

We are given that $K_p = 2.76$ and $P_{\text{HF}} = 0.0400 \, \text{atm}$ .

Unknown Quantities

We are asked to find the equilibrium partial pressure of $H_2$ , denoted by $P_{\text{H}_2}$ .

Solution Strategy

To solve this problem, we can use the equilibrium constant expression and the given information to set up an equation that relates the equilibrium partial pressures of the species involved in the reaction.

Setting Up the Equation

We can start by substituting the given values into the equilibrium constant expression:

2.76 = \frac{P_{\text{H}_2}P_{\text{F}_2}}{0.0400}

Simplifying the Equation

We can simplify the equation by multiplying both sides by $0.0400$ :

2.76 \times 0.0400 = P_{\text{H}_2}P_{\text{F}_2}

Using the Stoichiometry of the Reaction

From the reaction equation, we can see that the stoichiometry of the reaction is $1:1:1$ for HF, H $_2$ , and F $_2$ . This means that the partial pressures of H $_2$ and F $_2$ are equal at equilibrium.

Substituting the Stoichiometry into the Equation

We can substitute the stoichiometry into the equation:

2.76 \times 0.0400 = P_{\text{H}_2}^2

Solving for $P_{\text{H}_2}$

We can solve for $P_{\text{H}_2}$ by taking the square root of both sides:

P_{\text{H}_2} = \sqrt{2.76 \times 0.0400}

Calculating the Value

We can calculate the value of $P_{\text{H}_2}$ :

P_{\text{H}_2} = \sqrt{0.1104}

P_{\text{H}_2} = 0.332

Conclusion

In this problem, we were given an empty steel container that is filled with $0.0400 \, \text{atm}$ of HF. The system is allowed to reach equilibrium, and we were asked to find the equilibrium partial pressure of $H_2$ given that $K_p = 2.76$ for the reaction below. We used the equilibrium constant expression and the given information to set up an equation that relates the equilibrium partial pressures of the species involved in the reaction. We then simplified the equation and used the stoichiometry of the reaction to substitute the partial pressures of H $_2$ and F $_2$ . Finally, we solved for $P_{\text{H}_2}$ and calculated its value.

Final Answer

The final answer is: $\boxed{0.332}$

Introduction

In the previous article, we discussed how to find the equilibrium partial pressure of $H_2$ given that $K_p = 2.76$ for the reaction below:

\text{HF}(g) \rightleftharpoons \text{H}_2(g) + \text{F}_2(g)

We used the equilibrium constant expression and the given information to set up an equation that relates the equilibrium partial pressures of the species involved in the reaction. In this article, we will answer some common questions related to this problem.

Q: What is the significance of the equilibrium constant $K_p$ in this problem?

A: The equilibrium constant $K_p$ is a measure of the ratio of the partial pressures of the products to the partial pressure of the reactant at equilibrium. In this problem, $K_p = 2.76$ , which means that the partial pressure of $H_2$ and $F_2$ is 2.76 times the partial pressure of HF at equilibrium.

Q: How do we use the stoichiometry of the reaction to find the equilibrium partial pressure of $H_2$ ?

A: From the reaction equation, we can see that the stoichiometry of the reaction is $1:1:1$ for HF, H $_2$ , and F $_2$ . This means that the partial pressures of H $_2$ and F $_2$ are equal at equilibrium. We can use this information to substitute the partial pressures of H $_2$ and F $_2$ into the equilibrium constant expression.

Q: What is the relationship between the equilibrium partial pressures of the species involved in the reaction?

A: The equilibrium partial pressures of the species involved in the reaction are related by the equilibrium constant expression. In this problem, the equilibrium constant expression is:

K_p = \frac{P_{\text{H}_2}P_{\text{F}_2}}{P_{\text{HF}}}

Q: How do we solve for the equilibrium partial pressure of $H_2$ ?

A: We can solve for the equilibrium partial pressure of $H_2$ by substituting the given values into the equilibrium constant expression and simplifying the equation. We can then use the stoichiometry of the reaction to substitute the partial pressures of H $_2$ and F $_2$ into the equation.

Q: What is the final answer for the equilibrium partial pressure of $H_2$ ?

A: The final answer for the equilibrium partial pressure of $H_2$ is 0.332 atm.

Q: What is the significance of the equilibrium partial pressure of $H_2$ in this problem?

A: The equilibrium partial pressure of $H_2$ is a measure of the concentration of H $_2$ in the reaction mixture at equilibrium. It is an important quantity in understanding the behavior of the reaction and the properties of the reactants and products.

Q: How do we use the equilibrium partial pressure of $H_2$ in real-world applications?

A: The equilibrium partial pressure of $H_2$ can be used in real-world applications such as the design of chemical reactors, the optimization of reaction conditions, and the prediction of reaction outcomes.

Conclusion

In this article, we answered some common questions related to the equilibrium partial pressure of $H_2$ given that $K_p = 2.76$ for the reaction below:

\text{HF}(g) \rightleftharpoons \text{H}_2(g) + \text{F}_2(g)

We discussed the significance of the equilibrium constant $K_p$ , the relationship between the equilibrium partial pressures of the species involved in the reaction, and the solution strategy for finding the equilibrium partial pressure of $H_2$ . We also answered some common questions related to this problem.

Final Answer

The final answer is: $\boxed{0.332}$