- #1
ColinTI89
- 2
- 0
Homework Statement
At 400 degrees Celcius, Kc=64 for the equilibrium H2 + I2 = 2HI. If 3.0 mol H2 and 3.0 mol of I2 are introduced into an empty 4.0 L flask, find the equilibrium concentration of HI at 400 degrees Celcius.
Homework Equations
[HI]^2
--------
[I2]
The Attempt at a Solution
The answer given in the answer key is 1.2 M, which I am not getting. Since molarity is defined as mol/Liter, I calculate the molarity of the two given substances which is both 0.75 M. I set up the equation like this (sorry for the crappy quality):
...[HI]^2
64 = ----------
...[0.75] [0.75]
Multiplying 0.75 x 0.75 gives 0.5625 on the bottom. I then multiply both sides by 0.5625 to isolate [HI]^2. It now looks like this:
36=[HI]^2.
When I square root both sides I get 6.0, which doesn't sound correct anyways. Can anyone help? P.S. It's my first post on PhysicsForums!
Last edited: