Problem 5 : Write the mathematical expression for the equilibrium constant, Kc ,
ID: 520233 • Letter: P
Question
Problem 5:
Write the mathematical expression for the equilibrium constant, Kc, for each of the following
reactions:
(a) CH4 (g) + Cl2 (g) !!!! CH3Cl(g) + HCl(g)
(b) N2 (g) + O2 (g) !!!! 2NO(g)
(c) 2SO2 (g) + O2 (g) !!!! 2SO3(g)
(d) BaSO3(s) !!!! BaO(s) + SO2 (g)
Problem 6:
The initial concentrations or pressures of reactants and products are given for each of the
following systems. Calculate the equilibrium constant and determine the direction in which each
system will proceed to reach equilibrium.
(a) 2NH3(g) !!!! N2 (g) + 3H2 (g) [NH3] = 0.20 M, [N2] = 1.00 M, [H2] = 1.00 M
(b) 2SO3(g) !!!! 2SO2 (g) + O2 (g) [SO3] = 0.00 M, [SO2] = 1.00 M, [O2] = 1.00 M
Problem 7:
Suggest four ways in which the concentration of hydrazine, N2H4, could be increased in an
equilibrium described by the following equation:
N2 (g) + 2H2 (g) !!!! N2H4 (g) H = 95 kJ
Problem 8:
How will an increase in temperature affect each of the following equilibria? How will a decrease
in the volume of the reaction vessel affect each?
(a) 2NH3(g) !!!! N2 (g) + 3H2 (g) H = 92 kJ
(b) N2 (g) + O2 (g) !!!! 2NO(g) H = 181 kJ
(c) 2O3(g) !!!! 3O2 (g) H = – 285 kJ
(d) CaO(s) + CO2 (g) !!!! CaCO3(s) H = –176 kJ
Problem 9:
Nitrogen and oxygen react at high temperatures.
(a) Write the expression for the equilibrium constant (Kc) for the reversible reaction
N2 (g) + O2 (g) !!!! 2NO(g) H = 181 kJ
(b) What will happen to the concentrations of N2, O2, and NO at equilibrium if more O2 is
added?
(c) What will happen to the concentrations of N2, O2, and NO at equilibrium if N2 is removed?
(d) What will happen to the concentrations of N2, O2, and NO at equilibrium if NO is added?
(e) What will happen to the concentrations of N2, O2, and NO at equilibrium if the pressure on
the system is increased by reducing the volume of the reaction vessel?
(f) What will happen to the concentrations of N2, O2, and NO at equilibrium if the temperature of
the system is increased?
(g) What will happen to the concentrations of N2, O2, and NO at equilibrium if a catalyst is
added?
Explanation / Answer
5)
a)
Kc = concentration of products / concentration of reactants
= [CH3Cl][HCl] / [CH4][Cl2]
b)
Kc = [NO]^2 / [N2][O2]
c)
Kc = [SO3]^2 / [SO2]^2 [O2]
d)
solid is not considered which writing Kc expression
Kc = [SO2]
I am allowed to answer only 1 question at a time
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