The Reaction Quotient Video Lessons

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Problem: A system at equilibrium contains I2(g) at a pressure of 0.27 atm and I(g) at a pressure of 0.26 atm . The system is then compressed to half its volume.Find the pressure of I when the system returns to equilibrium.

FREE Expert Solution

We are being asked to find the pressure of I2 when the system returns to equilibrium. The given reaction is:

I2(g)  2 I(g)


We're going to calculate the pressure of I2 using the following steps:

Step 1: Calculate the equilibrium constant, Kp.
Step 2: Calculate the pressure after the system was compressed to half its volume.
Step 3: Calculate Q and determine the direction of reaction to reestablish the equilibrium.
Step 4: Set up an ICE chart and calculate the equilibrium pressure of I2.


Step 1: Calculate the equilibrium constant, Kp.

Given at equilibrium:

P I2(g) = 0.27 atm
P I(g) = 0.26 atm

Kp=productsreactantsKp=(PI)2PI2Kp=(0.26)20.27

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Problem Details

A system at equilibrium contains I2(g) at a pressure of 0.27 atm and I(g) at a pressure of 0.26 atm . The system is then compressed to half its volume.

Find the pressure of I when the system returns to equilibrium.

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