Chapter 15: Applications of Eq. Constants

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Chapter 15:
Applications of Eq. Constants
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Kelsey
Chemistry 178
Verkade
09/14/2010
1. Given the following information:
+
βˆ’
βˆ’4
𝐻𝐹(π‘Žπ‘ž) β†’
←𝐻(π‘Žπ‘ž) + 𝐹(π‘Žπ‘ž) 𝐾𝐢 = 6.8 × 10
+
2βˆ’
βˆ’6
𝐻2 𝐢2 𝑂4(π‘Žπ‘ž) β†’
←2𝐻(π‘Žπ‘ž) + 𝐢2 𝑂4(π‘Žπ‘ž) 𝐾𝐢 = 3.8 × 10
determine the value of KC for the reaction:
2βˆ’ β†’
βˆ’
2𝐻𝐹(π‘Žπ‘ž) + 𝐢2 𝑂4(π‘Žπ‘ž)
←2𝐹(π‘Žπ‘ž) + 𝐻2 𝐢2 𝑂4(π‘Žπ‘ž)
Kc = ((6.8 x 10^-4)^2)x(1/(3.8 x 10^-6)
2. The density of Tin (Sn) is 7.287 g/cm3, what is the concentration (molarity, M)?
7.287 g/cm^3 = 7.287 g/ml
(7.287 g/mL)*(1000 mL/1L)*(1 mol Sn/ 118.7 g Sn) = X M
3. Write the equilibrium constant expression for KC for each of the following reactions:
a. 𝐢𝑂2(𝑔) + 𝐻2(𝑔) β†’
←𝐢𝑂(𝑔) + 𝐻2 𝑂(𝑙)
Kc=([CO]/([H2][CO2]}
b. 𝑆𝑛𝑂2(𝑠) + 2𝐢𝑂(𝑔) β†’
←𝑆𝑛(𝑠) + 2𝐢𝑂2(𝑔)
Kc=([CO2]^2)/([CO]^2)
4. A closed system initially containing 1.000 x 10-3 M H2 and 2.000 x 10-3 M I2 at 448
degrees C is allowed to reach equilibrium. Analysis of the equilibrium mixture shows
that the concentration of HI is 1.87 x 10-3 M. Calculate KC at 448 degrees C for the
reaction taking place, which is:
𝐻2(𝑔) + 𝐼2(𝑔) β†’
←2𝐻𝐼(𝑔)
Make ICE table
Kc=(Equilibrium Concentration of H2 * Equilibrium Concentration of I2)/(Equilibrium
Concentration of HI squared)
Supplemental Instruction
1060 Hixson-Lied Student Success Center  294-6624  www.si.iastate.edu
5. At 448 degrees C the equilibrium constant KC for the reaction
𝐻2(𝑔) + 𝐼2(𝑔) β†’
←2𝐻𝐼(𝑔)
is 50.5. Predict in which direction the reaction will proceed to reach equilibrium at 448
degrees C if we start with 2.0 x 10-2 mol of HI, 1.0 x 10-2 mol of H2, and 3.0 x 10-2 mol of
I2 in a 2.00-L container.
Reaction will proceed toward Products (Q<K)
6. Consider the equilibrium 𝑁2 𝑂4(𝑔) β†’
←2𝑁𝑂2(𝑔) βˆ†π»° = 58.0 π‘˜π½
In which direction will the equilibrium shift when a) N2O4 is added, b) NO2 is removed,
c) the total pressure is increased by addition of N2(g), d) the volume is increased, e) the
temperature is decreased?
a)
b)
c)
d)
e)
Right
Right
Left
Right
Right
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