Principles of Chemistry II CHEM-1212K Equilibrium Problems Just beyond Exam #2 E

Question

Principles of Chemistry II CHEM-1212K Equilibrium Problems Just beyond Exam #2 Equilibrium 3Fe(s) + 4H20g) ?? 4Hag) + Feio.(s) Consider the reaction: If the total pressure is decreased suddenly by increasing the volume, 1. A) the equilibrium constant increases B) no change occurs. C) more Fe(s) is produced. E) more H:O(g) is produced. D) more H:(g) is produced. 2. At 700 Kelvin the equilibrium constant equals 540 for the reaction H:(g)+1) 2H(g) A mixture of H2, Iz and HI was introduced into a container at 700 Kelvin. If the initial concentrations in the container are?" [b]-0.30 M, and [HI]-2.2 M, which of the following is true? A) The reaction proceeds to the left producing more Hig) and Ig). B) At equilibrium, [H2] [] [Hlj. C) The reaction proceeds to the right producing more HI(g). D) No net change occurs because the system is at equilibrium. E) At equilibrium, [HI]-1.9 M. 3. The following endothermic reaction is at equilibrium [ 2S0,(g)+2S02(g)+0:(g)] is endothermic. Predict what will happen if the temperature is increased. C) Ke decreases A) the pressure decreases B) Ke remains the same D) more SO(g) is producedE) K increases For which one of the following reactions will KC-Kp? B) ZnO(s) + COg) ?Zn(s) + CO2(g) D) COC,(g) ? CO(g) + Cl2(g) A) CO g) + 2H2(g) ? CH,OH(g) C) 20,(g) 30,(g) 5. For the reaction favor production of ammonium chloride? NH3(g) + HC0g)?NH4Cl(s) AH?--177 kJ (exothermic). what conditions A) high temperature and low pressure C) addition of ammonium chloride E) high temperature and high pressure B) low temperature and low pressure D) low temperature and high pressure 6. As a rule, which of the following phases are not included in the equilibrium constant expression? I. pure liquids II. pure solids III. aqueous solutions IV.gases A)LI B) L IV C) I, IV D)II, II E) none of the above 7. For the reaction: 4 HCI g) + 02 g) 2 Cllg) + 2 H20(,) the equilibrium constant is 0.063 at 400 K. If the reaction quotient is 0.100, which of the following statements is not correct? A)[HCl] will increase. B)[OJ will increase. C)[CI will decrease. D) [H,OJ will increase.

Explanation / Answer

1.

If the gasesous products are greater than gaseous reactants, the decrease in pressure favours the formation of products.

If the gaseous reactants are greater than gaseous products, the decreas in pressure favors the formation of products.

If the gaseous reants and products are the same, the change in pressue does not effect the equilibrium.

Given reaction: 3 Fe(S) + 4 H2O (g) <------> 4 H2(g) + Fe3O4(s)

In the above equilibrium reaction, the number of moles of gaseous reactants (H2O) is 4 and the number of moles of geseous products (H2) is 4.

So, there is no pressure effect on the above equilibirum.

Answer: B) No change occurs.

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