Calculating Equilibrium Concentrations for a Gas Equilibrium Problem

In summary, gas equilibrium is the state in which the number of molecules leaving and entering a gas phase are equal, resulting in a constant concentration of gas molecules over time. It is achieved when there is a balance between the rates of forward and reverse reactions in a closed system. The factors that affect gas equilibrium include temperature, pressure, and initial concentrations of reactants and products. Gas equilibrium can be calculated using the equilibrium constant, which can be determined experimentally or through the equilibrium expression. Le Chatelier's principle explains how changes in temperature, pressure, or concentration can shift the equilibrium position of a gas system.
  • #1
oxide
2
0
PCl5 <---> PCl3 + Cl2
all are gases

PCl5 is 45% decomposed
if .110 mol of PCl5 is put in a 1.00 L container, what will
be the equilibrium concentrations of PCl5, PCl3, and Cl2?

PCl5 = .110 * .45 = .0495
.110-.0495= .0605 mol/L

so I've got .0605 mol/L for all 3 since all have the
same coeff. Is this how to solve?
 
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  • #2
0.110 - 0.0495 = 0.0605

So there's 0.0605 mol of PCl5, but how much PCl5 reacted? Therefore how much product was formed?
 
  • #3
.0495 mol of PCl3
.0495 mol of Cl2

right?
 
  • #4
You got it.
 

1. What is gas equilibrium?

Gas equilibrium refers to the state in which the number of molecules leaving and entering a gas phase are equal. This means that the concentration of gas molecules remains constant over time.

2. How is gas equilibrium achieved?

Gas equilibrium is achieved when there is a balance between the rate of forward and reverse reactions in a closed system. This means that the amount of reactants and products remain constant over time.

3. What factors affect gas equilibrium?

The factors that affect gas equilibrium include temperature, pressure, and the initial concentrations of reactants and products. Changes in these factors can shift the equilibrium position and affect the concentrations of the gas components.

4. How can gas equilibrium be calculated?

Gas equilibrium can be calculated using the equilibrium constant, which is a ratio of the concentrations of products and reactants at equilibrium. This constant can be determined experimentally or by using the equilibrium expression for a given reaction.

5. What is Le Chatelier's principle and how does it relate to gas equilibrium?

Le Chatelier's principle states that if a system at equilibrium is subjected to a stress, it will respond by shifting in a direction that minimizes the effect of the stress. In the case of gas equilibrium, changes in temperature, pressure, or concentration can act as stressors and cause the system to shift towards a new equilibrium position.

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