Hi Chocolatepistachio,
I suggest using a variable to represent the unknown concentrations. As the experiment is investigating the decomposition of NOCl
(g) and the initial amount of NOCl
(g) is given, the initial:
As it is unknown how much NOCl
(g) is reacted to form NO
(g) and Cl
2(g), we can use a variable to represent the change in mole. This change will be proportional to the NOCl:NO:Cl
2 ratio of 2:2:1.
meaning that since the volume of the flask is 2.00L, equilibrium moles will be
Now the equilibrium constant. Following
and the given equilibrium constant (at 35
oC, presumably the temperature of this experimental setup)
we can construct the equation
from which we can get
Applying polynomials, you would eventually come to
which can be substituted back into the original equilibrium mole values to get our final answers of:
at equilibrium.
Hope this helps, please let me know if there are any errors