Giới thiệu một số bài tập Hóa đại cương - phần Cân bằng hóa học bằng Tiếng Anh
EQUILIBRIUM
1. At 25 °C Kc = 7.0 x 1025 for the reaction: 2SO2(g) + O2(g)⇔2SO3(g). What is the value of KC for the reaction: 2SO3(g) ⇔ 2SO2(g) + O2(g) ?
2. Consider the following reactions and their Kc values at 25 °C
PCl3(g) + Cl2(g) ⇔ PCl5(g) K1
2NO(g) + Cl2(g) ⇔2NOCl(g) K2
What is the equilibrium constant for the reaction: PCl5(g) + 2NO(g) ⇔2NOCl(g) + PCl3(g) in terms of K1 and K2?
3. Given the following pair of reactions and their equilibrium constants:
2NO(g) + Cl2(g) ⇔ 2NOCl(g) KC = 3.20 x 10-3
2NO2(g) ⇔ 2NO(g) + O2(g) KC = 15.5
Calculate a value for Kc for the reaction: NOCl(g) + ½ O2(g) ⇔ NO2(g) + ½ Cl2(g)
4. Given the following pair of reactions and their equilibrium constants:
PCl3(g) + ½ O2(g) ⇔POCl3(g) K1
NO(g) + ½ O2(g) ⇔ NO2(g) K2
What is equilibrium constant for the reaction?
PCl3(g) + NO2(g) ⇔ POCl3(g) + NO(g)
5. The equilibrium constant for the reaction: H2(g) + I2(g)⇔2HI(g) is 54.9 at 699 K What is the equilibrium constant for the reaction 4HI(g) ⇔ 2H2(g) + 2I2(g) under the same conditions?
6. The reaction, 2SO3(g) ⇔ 2SO2(g) + O2(g) is endothermic. Predict what will happen if the temperature is increased.
7. Consider the following system, which is at equilibrium: CO(g) + 3H2(g) ⇔ CH4(g) + H2O(g). What would be the result of removing CH4(g) and H2O(g)?
8. Consider the following system at equilibrium: 3C(s) + 3H2(g) ⇔ CH4(g) + C2H2(g). What would be the result of adding CH4(g) and C2H2(g)?
9. The system, H2(g) + X2(g) ⇔ 2HX(g) has an equilibrium constant (KC) = 24.4. If a system contained 0.150 moles of H2(g) and 0.150 moles of X2(g) and 0.600 moles of HX in a 3.00 L container. Which way would the reaction proceed?
10. For the reaction system: 2SO2(g) + O2(g) ⇔2SO3(g) the equilibrium concentrations are: [SO3] = 0.120 M; [SO2] = 0.860 M; [O2] = 0.330 M. Calculate the value of KC for this reaction.
11. A 1.20-L flask contains an equilibrium mixture of 0.0168 mol of N2, 0.2064 mol of H2, and 0.0143 mol of NH3.
Calculate the equilibrium constant, Kc for the reaction: N2(g) + 3H2(g) ⇔ 2NH3(g)
12. At a certain temperature, 0.500 mol of PCl5 was placed into a 0.250 L vessel and permitted to react as shown: PCl5(g) ⇔ PCl3(g) + Cl2(g) At equilibrium, the container held 0.100 mol of PCl5. What is the value of Kc?
13. A mixture of 2.0 mol of CO(g) and 2.0 mol of H2O(g) was allowed to come to equilibrium in a 1.0 L flask at a high temperature. If Kc = 4.0, what is the molar concentration of H2(g) in the equilibrium mixture: CO(g) + H2O(g) ⇔ CO2(g) + H2(g)?
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