What are the initial concentrations of H2(g), I2(g), and HI(g) …

Chemistry Questions
Short Answer
Step by Step Solution
Chemistry Questions

(a) The original value of the reaction quotient, Qc, for the reaction of H2(g) and I2(g) to form HI(g) (before any reactions take place and before equilibrium is established), was 5.56. On the following graph, plot the points representing the initial concentrations of all three gases. Label each point with the formula of the gas.

Short Answer

To determine the initial concentration of hydrogen iodide (HI), start with the balanced equation and the given concentrations of H‚CC (0.030 mol¬∑L‚Aª¬π) and I‚CC (0.015 mol¬∑L‚Aª¬π). Calculate the concentration of HI using the reaction quotient equation, resulting in an initial concentration of HI of 0.50 mol/L, and then graph the concentrations to visualize the data.

Step-by-Step Solution

Here’s how to determine the initial concentration of hydrogen iodide (HI) step by step.

Step 1: Gather Chemical Information

Start by identifying the balanced chemical equation that shows the relationship between reactants and products. In this case, we have:

  • H‚ÄöCC + I‚ÄöCC ‚Äöaa 2HI

Note the initial concentrations given for reactants: H‚CC is 0.030 mol¬∑L‚Aª¬π and I‚CC is 0.015 mol¬∑L‚Aª¬π. We will need this data to proceed with our calculations.

Step 2: Calculate the Concentration of HI

Using the concentration values, set up the equation for the reaction quotient Q‚ÄöCi. The equation is:

  • Q‚ÄöCi = [HI]¬¨‚⧠/ ([H‚ÄöCC][I‚ÄöCC]) = x¬¨‚⧠/ (0.30 ‚àöo 0.15)

From this, you can find x¬≤ by rearranging: x¬≤ = 0.30 √o 0.15 √o 5.56. By calculating, we find x = 0.50 mol/L, which gives us the initial concentration of HI.

Step 3: Visualize the Data

The next step is to visualize the initial concentrations on a graph. Plot the values as follows:

  • On the vertical axis, place the concentrations of H‚ÄöCC, I‚ÄöCC, and HI.
  • Mark the points corresponding to 0.030 for H‚ÄöCC, 0.015 for I‚ÄöCC, and 0.50 for HI.

This visual representation will help in analyzing the relationship between these reactants and the product at the start of the reaction.

Related Concepts

Chemical Equation

A mathematical representation of a chemical reaction showing the reactants and products along with their respective amounts and states.

Reaction Quotient

A ratio used in chemistry that expresses the relative concentrations of reactants and products at any given point in time, typically denoted as q.

Initial Concentration

The concentration of a substance in a solution at the start of a chemical reaction, often necessary for determining the progress and equilibrium of the reaction.

Table Of Contents
  1. (a) The original value of the reaction quotient, Qc, for the reaction of H2(g) and I2(g) to form HI(g) (before any reactions take place and before equilibrium is established), was 5.56. On the following graph, plot the points representing the initial concentrations of all three gases. Label each point with the formula of the gas.

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