Answers for Chemical Equilibrium Practice Problems
  1. Use LeChatlier's Principle

    2. a) shift R

    b) no shift

    c) no shift

    d) shift L

    e) shift L

  2. a) The system shifted to the right to form products.

b) 4 HCl + O2 à Cl2 + 2 H2O

4 HCl

O2

Cl2

2 H2O

0.50

0.050

0

0

M initial

-4(0.048)

-0.048

+0.048

+2(0.048)

M change

0.308

0.002

0.048

0.096

M at eq.

Kc = [Cl2][ H2O]2/[ HCl]4[ O2]

Kc = (0.048M)(0.096M)2/(0.308M)4(0.002M)

Kc = 25 1/M2

c) change in gas moles = -2

Kp = Kc*(RT)-2

Kp = (25 1/M2)(0.08206 L*atm/mol*K * 298K)-2

Kp = 0.041 atm-2