Exercises and Answers about Chemical Equilibrium in Gaseous System (Beberapa soal latihan beserta jawaban mengenai Keseimbangan Kimia dalam sistem Gas)
φ Write equilibrium expressions for Kp and Kc for each of the following reactions:
φ At 25 °C, the equilibrium constant Kc = 1,4 x 107 for the reaction:
What is the value of Kc at this temperature for the following reactions:
φ Consider the following equilibria and their equilibrium constants:
Determine the equilibrium constant Kc for the reaction:
φ Arrange the following reactions in order of their increasing tendency to proceed toward completion:
Jawaban : Jika nilai “K” besar semakin tidak larut. Jadi, urutannya yaitu a → d → c → b
φ The following thermodynamic data apply at 25 °C :
|Substance||∆ GoF (KJ / mol)|
a. What is ∆ Go (in KJ) for the reaction:
b. What is Kp for this reaction?
a. ∆ Go = ∆ GoF NiSO4 + ∆ GoF 6H2O – ∆ GoF NiSO4.6H2O
∆ Go = [ -773,6 + 6 (-228) – (-2222)]
∆ Go = 80,4 KJ
b. ∆ G = – RT ln Kp
80,4 KJ/mol = – 8,314 J/K mol (25 +273) K ln Kp
Kp = [H2O]6
80400 J/mol = – 8,314 J/ K mol (298) K ln Kp
80400 = – 2477,572 ln Kp
ln Kp = – 32,451
Kp = 8,06 x 10-15
φ The reaction :
is also a source of Hydrogen. At 1500 °C, its value of Kc = 5,67. What is its value of Kp at this temperature?
φ At 700 K, ∆ Go 700K = – 13,5 KJ for the reaction :
Calculate the value of Kp for the reaction at 700 K.
φ The equilibrium constant, Kp, for the reaction :
has a value of 4,56 x 10-2 atm at 395 °C. What the value of ∆ Go 668K (in KJ) for this reaction?
φ Consider the equilibrium :
How would the following affect the position of equilibrium?
a. addition of PCl3 → reaksi bergeser ke kanan
b. removal of Cl2 → reaksi bergeser ke kiri
c. removal of PCl5 → reaksi bergeser ke kanan
d. decrease in the volume of container → tidak ada perubahan
e. addition of He without a change in volume → tidak ada perubahan
Nb : Jawaban yang berwarna hijau
φ Indicate how each of the following changes affect the amount of H2 in the system below, for which ∆Hreaction = +41 KJ (Endoterm).
a. addition of CO2 → reaksi bergeser ke kanan
b. addition of H2O→ reaksi bergeser ke kiri
c. addition of Catalyst → tidak ada perubahan (reaksinya cepat)
d. increase in temperature → reaksi bergeser ke kiri
e. decrease in the volume of the container → tidak ada perubahan
Nb : Jawaban yang berwarna hijau
φ In a particular experiment the following partial pressures were determined for the reaction at equilibrium :
p NO = 0,65 atm, p Cl2 = 0,18 atm, p NOCl = 0,15 atm
What is Kp for this reaction at the temperature at which the experiment was performed?
φ At 25 °C, 0,0560 mol of O2 and 0.020 mol N2O were placed in a 1,00 L vessel and allowed to react according to the equation:
When the system reached equilibrium, the concentration of the NO2 was found to be 0,020 mol/L.
a. what were the equilibrium molar concentration of N2O and O2 ?
b. what is the value of Kc for this reaction at 25 °C ?
φ For the reaction :
Kc = 0,771 at 750 °C. If 1,00 mol of H2 and 1,00 mol of CO2 are placed into a 5,00 L container and permitted to react, what will the concentrations of all four gases be at equilibrium?
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