Question:1.
The first equilibrium expression (K
C
) as represented by the first chemcial
equation is 5.81 × 10
7
at 700 K. Calculate the value of the equilibrium expression for the
second equation at the same temperature.
Solution:
The equilibrium expression for
is,
The equilibrium expression for the second equation,
, is
Notice the relationship between the two equilibrium expressions
The equilibrium constant of the second equation is the square root of the first.
Question 2:
When 82.9 grams of H
2
O (g) and 400. grams of Cl
2
O (g) are placed in a
190000 mL reaction vessel at 514 °C and allowed to come to equilibrium the mixture
contains 3.86 mol of HOCl (g). How many mol / L of H
2
O (g) reacted?
Solution:
Determine the equilibrium concentration of HOCl
Employ the stoichiometric relationship of HOCl and H
2
O to determine the concentration
of H
2
O that reacted.
Equilibrium Concentrations
Question 3:
Calculate the value of the equilibrium constant (K
C
) for the reaction
displayed if the following concentration data were measured at 100. °K: [H
2
] = 5.24 M;
[D
2
] = 5.24 M; [HD] = 7.26 M.
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Solution:
The equilibrium constant is equal to the concentrations of the products over the
reactants at equilibrium. Each compound is also raised to the power of its stoichiometric
coefficient.
Question 4:
The initial pressures for the compounds involved in the reaction displayed
were determined to be P(H
2
) = 5.90 atm; P(I
2
) = 7.60 atm; P(HI) = 0 atm. Calculate the
value of the equilibrium constant (K
p
) at 427°C, if the equilibrium pressure of H
2
was
0.782.
Solution:
Determine how many atm of H
2
reacted by subtracting the equilibrium pressure
from the initial pressure.
5.90 atm  0.782 atm = 5.12 atm reacted.
If 5.12 atm of H
2
reacted, then 5.12 atm of I
2
reacted. Determine the equilibrium pressure
of I
2
by subtracting the atm reacted from the initial pressure.
7.60 atm  5.12 atm = 2.48 atm.
From the stoichiometric relationship determine how many atm of HI are formed when
5.12 atm of H
2
react.
The partial pressures of the three gases at equilibrium are P(HI) = 10.24 atm; P(I
2
) = 2.48
atm; P(H
2
) = 0.782 atm.
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 Spring '09
 DR.KRISH
 Equilibrium, Reaction

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