Consider the system below at equilibrium at 200°C. 2 Cl 2 (g) + 2 H 2 O(g) ßà 4
ID: 478790 • Letter: C
Question
Consider the system below at equilibrium at 200°C.
2 Cl2(g) + 2 H2O(g) ßà 4 HCl(g) + O2(g) DH = -184.36 kJ
Which response contains all the stresses listed that will result in a shift of the equilibrium so that more HCl (g) is produced when equilibrium is re-established?
I. Adding Cl2.
II. Raising the temperature at constant pressure.
III. Decreasing the volume at constant temperature.
IV. Increasing the pressure at constant temperature.
V. Removing O2.
A. I, II, and III.
B. II, IV and V
C. III and IV
D. I and V
E. II and IV
Explanation / Answer
According to Lechateriels Principle
1. If more reactant is added, the equation will shift to the right in order to make more product (which will increase the products)
b. If the temperature is decreased, the reaction will shift to the right to create more heat if it is exothermic (which will increase the product), and to the left if it is endothermic (which will decrease the products)
c. If the pressure is decreased, it will shift in the direction where there are more moles of gas present, because it can now take up more space. If the products have more moles of gas, the products will increase, and vise versa.
Correct answer is (D)