Friday

December 19, 2014

December 19, 2014

Posted by **Linda** on Wednesday, May 2, 2007 at 5:49pm.

at 55degrees the K for the reaction: 2NO2(g)<=>N2O4 is 1.15

calc the concentration of N2O4 present in equilibrium with 0.50 mole of NO2

I first used the ICE chart then calculated

1.15 = x/(0.5-2x)^2

O.5-2x~ ).5

1.15 = x/(0.5)^2

1.15(0.25) = x

x= 0.2875

2(0.2875) - 0.575

Therefore N2O4 = 0.575M?

I dont agree that you can assume .5-2x is approximately .5. Your final answer shows that it is not.

1.15 = x/(0.5-2x)^2

(0.5-2x)^2= x/1.15

.25 -2x +4x^2= .696x

put the terms together, and use the quadratic equation for x.

then would my answer look like this

0.25-2.696x + 4x^2 = 0

and I would also like to understand how did you get 0.696?

I dont know how I got .696 . It should have been 1/1.15=.869

Now that you have the quadratic,

0.25-2.896x + 4x^2 = 0

Use the quadratic equation

x= (2.896 +- sqrt (8.23-4) )/8

x= .618

or x=.104

Now obviously, the first is impossible (why?), so the concentration the product is .104, and the concentration of the reactant is .5-.208

check my calc work

**Answer this Question**

**Related Questions**

Microeconomics (margin Utility) need clarification - Someone was kind enough to ...

Science/ Social Studies - I need help with those two subjects. Please tell us ...

Algebra 1 - I'm completeing parts of my homework, and need help checking some of...

Math - Actually, i made a mistake. All though we still came up with the right ...

chemistry - This question I really don't get it. I tried tried tried to figure ...

Chem - There is this one question that akss for the sum of bond dipoles. I don't...

Algebra - 1. (2x-6)/(21) divided by (5x-15)/(12) 2. Solve (x)/(x-9)-4=(9)/(x-9...

Pigskin geography - I need help with week number 6, the question about bullfrogs...

toxicology- can someone re work this question? - Hi, I have to answer this ...

Grade 12 Physics - CAN SOMEONE PLEASE HELP ME WITH MY QUESTION I AM REALLY STUCK...