CH302 Worksheet 3—Introduction to Chemical Equilbria Answer Key
1. Write a mass action quotient (aka mass action expression) for the general equation below:
aA
+
bB
cC
+
dD
Q = [C]
c
·[D]
d
/ [A]
a
·[B]
b
2. What sort of mathematical relationship exists between
Δ
G and K? Which of these terms should have
a wider range of possible values?
There is a loglinear (aka exponential) relationship between
Δ
G and K  when
Δ
G increases, K
increases exponentially. K should have a wider range of values, since it is proportional to the base
e
exponent of
Δ
G, i.e. if
Δ
G is doubled, K will increase by a factor equal to
e
2
.
3. What is the difference between Q and K?
Q can have any value depending on the concentrations of reactants and products, and it can describe
any and all nonequilibrium states for a system. K, on the other hand, can have only one value at a
given temperature and pressure and that value is always equal to the mass action quotient when the
system is at equilibrium.
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 Spring '11
 Cathy
 Math, Exponential Function, Chemical reaction, Moles, Equivalence relation, mass action quotient

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