Transcript Calculating K - Gordon State College

Problem 27, p 615
• At 327 oC, the equilibrium concentrations are
[CH3OH] = 0.15 M, [CO] = 0.24 M and [H2] =
1.1 M for the reaction:
•
•
CH3OH (g) D CO (g) + 2H2 (g)
Calculate Kp at this temperature.
Problem 31, p. 615
• Consider the following rxn. at a certain
temperature:
• Fe (s) + 3 O2 (g) D 2 Fe2O3 (s)
• An equil. mixture contains 1.0 mole Fe, 0.0010
mole O2 and 2.0 mole Fe2O3 all in a 2.0 L
container. Calculate Kc for this reaction.
Problem 39, p. 616
• A 1.00 L flask was filled with 2.00 mole
gaseous SO2 and 2.00 mole of NO2 and
heated After equil. was reached, it was
found that 1.30 mole gaseous NO was
present. Calculate the value of Kc for:
• SO2 (g) + NO2 (g) D SO3 (g) + NO (g)
Problem 52, p. 617
• At a particular temperature, Kc = 4.0 x 10-7 for
the reaction:
N2O4 (g) D 2NO2 (g)
In an expt. 1.0 mole of N2O4 is placed in a 1.00 -L
vessel. Calculate the concentrations of N2O4 and
NO2 when this reaction reaches equilibrium.
Use of Approximation
• Approximations can be used if the value of K
is so small that the terms (-x) or (+x) will
barely have an effect.
• Validity of approximation:
•
______[x]______
=
[initial concentration]
< 5%
< 5%