Ptz System
May 4th, 2010
Which of the following is correct?(10 ptz and 5 stars for explaining your answer>i promice?
Consider the following equilibrium system:
PCl5(g) <=> PCl3(g) + Cl2(g)
At equilibrium, [PCl5] is 0.400 M, [PCl3] is 1.50 M and [Cl2] is 0.600 M.
The Keq for the reaction is ...
a. 0.360
b. 0.444
c. 0.900
d. 2.25
e. 4.65
since concentrations are given, we can assume that the equilibrium constant is in concentration dimensions. So:
For the reaction:
aA + bB + cC... ---> zZ + yY + xX....
at equilibrium, the equilibrium constant would equal:
Keq = [Z]^z * [Y]^y * [X]^x ... / [A]^a + [B]^b * [C]^c...
In other words, products over reactants, each concentration raised to the power of the stoichiometric coefficient with the results multiplied.
So, we get:
Keq = (1.5^1) * (.6^1) / (.4^1) = (1.5*.6)/(.4) = 2.25
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