# Worksheet 2 - Equilibria

Determine the equilibrium constant for the reaction below given the equilibrium concentrations of the reactant and products:

A.                      2 NO2(g)            2 NO(g)   +   O2(g)                                @ 25 °C

Equil. (atm):       0.10             0.0015        0.051

Determine the equilibrium concentrations for the reactant(s) and product(s) of the following systems:

B.                      CH3COOH(aq) + H2O(l)        H3O+(aq) + CH3COO(aq)            Keq = 1.8´10–5  @ 25 °C

Initial (M):             0.050                                   0                  0.20

C.                    H2 (g) + Br2 (g)            2HBr (g)                                                     Keq = 1.6 × 105

Initial (atm):     0          0                     10

D.                      N2(g) + 3 H2(g)          2 NH3(g)                                                     Keq = 0.040 @ 650 °C

Initial (atm):    0.15      0.25                0

E.                      2 NO(g) + O2(g)           2 NO2(g)                                                  Keq = 4.2´1012 @ 25 °C

Initial (atm):        5.0        5.0                 0

Equil. (atm):