A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity
1 answer:
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Answer : The correct option is, (a) 0.44
Explanation :
First we have to calculate the concentration of .
Now we have to calculate the dissociated concentration of .
The balanced equilibrium reaction is,
Initial conc. 1.0 M 0
At eqm. conc. (1.0-x) M (2x) M
As we are given,
The percent of dissociation of =
= 28.0 %
So, the dissociate concentration of =
The value of x = = 0.28 M
Now we have to calculate the concentration of at equilibrium.
Concentration of = 1.0 - x = 1.0 - 0.28 = 0.72 M
Concentration of = 2x = 2 × 0.28 = 0.56 M
Now we have to calculate the equilibrium constant for the reaction.
The expression of equilibrium constant for the reaction will be:
Now put all the values in this expression, we get :
Therefore, the equilibrium constant for the reaction is, 0.44
given E = 9.4145E-25
h = 6.626E-34
c = 2.998E8
sub values into the equation above, and solve for wavelength.
You will get 0.211m