If a 1.0 L flask is filled with 0.22 mol of N2 and 0.22 mol of O2 at 2000°C, what is [NO] after the reaction establishes equilibrium? (K = 0.10 at 2000°C)

1. At a certain temperature, Kc equals 1.4 × 102 for the reaction: 2 CO(g) + O2(g) 2 CO2(g).      If a 2.50-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium, how many moles of CO are      also present in the flask?

The following reaction is important in the manufacture of sulfuric acid. SO2(g) + 1/2 O2(g)  SO3(g) At 900 K, 0.0178 mol of SO2 and 0.0214 mol of O2 are sealed in a 1.00-L reaction vessel. When equilibrium is reached, the concentration of SO3 is determined to be 0.0154 M. Calculate Kc for this reaction.

For the equilibrium reaction: 2NO2 ⇌ N2O4 When 0.2 mol of NO2 is added to a 1.0 L flask at 25°C. K = 2.6. What are the equilibrium concentrations?