NAME:
Str:
DAIL
DIRECTION: Answer all questions correctly for full marks
1. Give PCs(e) = PC13(e) + Cl2(8)
At 250°C, a sample of PCIs was placed in a 241. For evacuated reaction vessel and
allowed to come to equilibrium. Analysis showed that at equilibrium 0.42 mole PCI,
0.64mole of PC13, and 0.64mole of Cl2 were present in the vessel. Calculate kc and Kp
for this system at 250°C
2. What effect does the presence of a catalyst have on the position of equilibrium for a
reversible reaction why?
3. Define and illustrate the following terms: (a) reversible reaction (b) chemical
equilibrium (c) equilibrium constant.
4. Why chemical equilibria are called dynamic equilibria?
5. State the difference between heterogeneous and homogeneous equilibria
6. Derived the relationship between Kc and Kp for this reaction. 2H2S(g) + 3 O2 = 2H
O(B) + 2 SO218)
7. Write the Unite Kp for each of the following reactions, if the Unit of pressure is atm.
(a) M + 2N = D + 4E (b) Q + R = 25 (c) N2 + 3H2 = 2NH3
8. State four (4) characteristics of a catalyst.
9. State and explain the effect of increasing the volume of the reaction vessel on the
equilibrium constant and the equilibrium concentration of SO3.
10. State the difference between amniriaal