Question

Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C if the initial concentrations are...

Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C if the initial concentrations are [N2O4]= 0.0210 M and [NO2]= 0.0340 M. The equilibrium constant Kc for the reaction N2O4(g)⇌2NO2(g) is 4.64×10−3 at 25 ∘C.

1) Calculate the equilibrium concentration of N2O4.

2) Calculate the equilibrium concentration of NO2.

I have worked through this problem several times and keep getting the wrong answer. I think I'm making a math error along the way. Could you show as much work as possible so I can see where I'm messing up? Thank you!

Homework Answers

Answer #1

N2O4 < -----> 2NO2

Qc = [NO2]^2 / [N2O4]
     = (0.034)^2 / (0.0210)
     =0.055
Since Qc>Kc, reaction will shift to left

Let at equilibrium:
[N2O4] = 0.0210 + x
[NO2] = 0.0340 -2x

use:
Kc = [NO2]^2 / [N2O4]
4.64*10^-3 = (0.034 -2x )^2 / (0.0210+x)
4.64*10^-3*(0.0210+x) = (0.034-2x)^2
9.744*10^-5 + 4.64*10^-3*x = 1.156*10^-3 - 0.136*x + 4x^2
4x^2 - 0.14064 x +1.059*10^-3 = 0

Solving above equation we get,
x = 0.024 M
and x = 0.011 M

x can't ne 0.024 M because in that case [NO2] = 0.0340-2x will become negative
so,
x = 0.011 M

[N2O4] = 0.0210 + x = 0.0210 + 0.011 = 0.032 M
[NO2] = 0.0340 -2x = 0.0340 - 2x = 0.0340 - 2*0.011 = 0.012 M

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C in a vessel that contains...
Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C in a vessel that contains an initial N2O4 concentration of 0.0365 M . The equilibrium constant Kc for the reaction N2O4(g)⇌2NO2(g) is 4.64×10−3 at 25 ∘C. Express your answers using four decimal places separated by a comma.
Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C in a vessel that contains...
Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C in a vessel that contains an initial N2O4 concentration of 0.0507 M . The equilibrium constantKc for the reaction N2O4(g)⇌2NO2(g) is 4.64×10−3 at 25 ∘C.
Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C in a vessel that contains...
Calculate the equilibrium concentrations of N2O4 and NO2 at 25 ∘C in a vessel that contains an initial N2O4 concentration of 0.0438 M . The equilibrium constant Kc for the reaction N2O4(g)⇌2NO2(g) is 4.64×10−3 at 25 ∘C. Express your answers using four decimal places separated by a comma. [N2O4], [NO2] = _________________________ The air pollutant NO is produced in automobile engines from the high-temperature reaction N2(g)+O2(g)⇌2NO(g);Kc=1.7×10−3at 2300 K. If the initial concentrations of N2 and O2 at 2300 K are...
A flask is charged with 1.800atm of N2O4(g) and 1.00 atm NO2(g) at 25 ?C, and...
A flask is charged with 1.800atm of N2O4(g) and 1.00 atm NO2(g) at 25 ?C, and the following equilibrium is achieved: N2O4(g)?2NO2 After equilibrium is reached, the partial pressure of NO2 is 0.512atm . Calculate Kc for the reaction.
A flask is charged with 1.500 atm of N2O4(g) and 1.00 atm NO2(g) at 25 ∘C,...
A flask is charged with 1.500 atm of N2O4(g) and 1.00 atm NO2(g) at 25 ∘C, and the following equilibrium is achieved: N2O4(g)⇌2NO2 After equilibrium is reached, the partial pressure of NO2 is 0.514 atm . Calculate Kc for the reaction.
A flask is charged with 1.800 atm of N2O4(g)and 1.00 atm NO2(g) at 25 ∘C, and...
A flask is charged with 1.800 atm of N2O4(g)and 1.00 atm NO2(g) at 25 ∘C, and the following equilibrium is achieved: N2O4(g)⇌2NO2 After equilibrium is reached, the partial pressure of NO2 is 0.515 atm . What is the equilibrium partial pressure of N2O4? Calculate the value of Kp for the reaction Calculate Kc for the reaction.
A flask is charged with 1.800 atm of N2O4(g)and 1.00 atm NO2(g) at 25 ∘C, and...
A flask is charged with 1.800 atm of N2O4(g)and 1.00 atm NO2(g) at 25 ∘C, and the following equilibrium is achieved: N2O4(g)⇌2NO2 After equilibrium is reached, the partial pressure of NO2 is 0.517 atm . 1)What is the equilibrium partial pressure of N2O4? Express your answer with the appropriate units. 2)Calculate the value of Kp for the reaction. 3)Calculate Kc for the reaction.
A flask is charged with 1.550 atm of N2O4(g)and 1.00 atm NO2(g) at 25 ∘C, and...
A flask is charged with 1.550 atm of N2O4(g)and 1.00 atm NO2(g) at 25 ∘C, and the following equilibrium is achieved: N2O4(g)⇌2NO2 After equilibrium is reached, the partial pressure of NO2 is 0.519 atm . 1.What is the equilibrium partial pressure of N2O4?Express your answer with the appropriate units. 2. Calculate the value of Kp for the reaction. 3.Calculate the value of Kc for the reaction.
A flask is charged with 1.800 atm of N2O4(g) and 1.00 atm of NO2(g) at 25...
A flask is charged with 1.800 atm of N2O4(g) and 1.00 atm of NO2(g) at 25 ∘C , and the following equilibrium is achieved: N2O4(g)⇌2NO2(g) After equilibrium is reached, the partial pressure of NO2 is 0.519 atm . Part A: What is the partial pressure of N2O4 at equilibrium? Part B: Calculate the value of Kp for the reaction.​ Part C: Calculate the value of Kc for the reaction.​
For the reaction shown here, Kc = 0.513 at 500 K. N2O4(g)⇌2NO2(g) If a reaction vessel...
For the reaction shown here, Kc = 0.513 at 500 K. N2O4(g)⇌2NO2(g) If a reaction vessel initially contains an N2O4 concentration of 4.50×10−2 M at 500 K, what are the equilibrium concentrations of N2O4 and NO2 at 500 K?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT