Math 14c
Math 14c: Additional Stress Problems
1. Predict the effect of each of the following on the indicated equilibrium system in terms of which reaction (forward, reverse, or neither) will be favored.
1. Answers:
a) forward (right)
b) forward (right)
c) neither
d) forward (right)
e) reverse (left)
f) neither
g) reverse (left)
h) neither
H2(g) + Cl2(g) ⇌ 2HCl(g) + 184 kJ
a) addition of Cl2
b) removal of HCl
c) increased pressure
d) decreased temperature
e) removal of H2
f) decreased pressure
g) increased temperature
h) decreased system volume
2. What changes in concentration, pressure or temperature would favor (increase) the concentration of the compound in bold:
a) 2CO(g) + O2(g) ⇌ 2CO2(g) + 167 kJ
b) Cu2+(aq) + 4NH3(aq) ⇌ [Cu(NH3)4]2-(aq) + 42 kJ
c) 2HI(g) + 12.6 kJ ⇌ H2(g) + I2(g)
d) 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g) + 113 kJ
Answers:
a) add reactants, increase pressure, lower temperature
b) add reactants, lower temperature
c) add reactants, increase temperature
d) add reactants, increase pressure, lower temperature