Equilibrium II

Today I handed back exams and we continued to talk about equilibrium. The average on the exam was around 115/150.

In case you misplaced your problem set (or just want another one...), here's it is:

Chem 210 – Summer 2009 – Problem Set #4

1. Oxygen gas and chlorine gas react in the atmosphere to form chlorine dioxide, one of the substances responsible for ozone destruction. In a laboratory experiment, 18.237g of oxygen gas and 31.294g of chlorine gas are combined in a 8.00L vessel and allowed to reach equilibrium. At equilibrium, the chlorine concentration is found to be 48.9mM. What is the equilibrium constant for this reaction? Is this reaction product-favored?

2. Carbon dioxide reacts with ammonia (NH₃) in the gas phase to produce formamide (HCONH₂) and oxygen. If 15.215g of CO₂(g) and 4.139g of ammonia are combined in a 3.50L vessel and allowed to react equilibrium, the formamide concentration is found to be 24.8mM. What is the equilibrium constant for this reaction? Is this reaction product-favored or reactant-favored?

3. Graphite (solid carbon) reacts with oxygen gas to form carbon dioxide gas. You have sealed 23.84g of graphite and 53.97g of oxygen in a 12.00L vessel and allowed the system to react equilibrium at 73.91°C. If the equilibrium constant value is 294.7 at this temperature, what are the equilibrium concentrations of all reactants and products?

4. At 149.79°C, methane, CH₄(g), reacts with oxygen to form carbon dioxide and water with an equilibrium constant value of 6.43x10⁶. If you combine 6.85g of methane with 29.99g of oxygen in a 18.00L vessel, raise the temperature to 149.79°C, and allow the mixture to react equilibrium, what are the concentrations of all reactants and products?