Problem: The reaction X2(g) ⇌ 2X(g) occurs in a closed reaction vessel at constant volume and temperature. Initially, the vessel contains only X2 at a pressure of 1.75 atm. After the reaction reaches equilibrium, the total pressure is 2.75 atm.What is the value of the equilibrium constant, Kp, for the reaction?

🤓 Based on our data, we think this question is relevant for Professor Siler's class at OREGONSTATE.

FREE Expert Solution
FREE Expert Solution

We are being asked to calculate the equilibrium constant, Kp for the given equilibrium reaction:


X2(g) ⇌ 2X(g)


When dealing with equilibrium and Kp:

Kp→ equilibrium units are in terms of pressure
Kp is an equilibrium expression:

Kp=productsreactants

only gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression


Given:    

Initial Concentrations:

PX2 = 1.75 atm
PX = 0 atm


In order to calculate the equilibrium concentrations of species, we need to use an ICE Chart



Given values at equilibrium:

Ptotal = 2.75 atm


Calculate x:

Ptotal = PX2 +PX2.75= 1.75-x +2x2.75= 1.75 + x x = 2.75 - 1.75

x = 1.00 atm


We can now calculate the equilibrium constant, Kp:

 X2(g) ⇌ 2X(g)


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Problem Details

The reaction X2(g) ⇌ 2X(g) occurs in a closed reaction vessel at constant volume and temperature. Initially, the vessel contains only X2 at a pressure of 1.75 atm. After the reaction reaches equilibrium, the total pressure is 2.75 atm.

What is the value of the equilibrium constant, Kp, for the reaction?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the ICE Chart concept. You can view video lessons to learn ICE Chart. Or if you need more ICE Chart practice, you can also practice ICE Chart practice problems.

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Based on our data, we think this problem is relevant for Professor Siler's class at OREGONSTATE.