- Consider the dissociation of PCl5
PCl5 → PCl3 + Cl2
- Give the geometry of PCl5 and PCl3.
- Use the following bond energies to calculate Ã†HÂ° for this reaction in the gas phase:
P-Cl 326 kJ/mol; Cl-Cl 240 kJ/mol
- Calculate the ΔH° for the reaction using the following standard heats of formation (in the gas phase):
PCl5 -371 kJ/mol; PCl3 -279 kJ/mol
- When 1.0 mole of PCl5 is dissolved in 2.0 L of solution at some temperature and the reaction is allowed to reach equilibrium, 0.60 mole of PCl3 is obtained. Calculate the equilibrium constant.
- If the reaction is started again with 2.0 mole of PCl5 dissolved in 2.0 L of solution, how much PCl3 will be obtained when equilibrium is established?
- When the reaction
2CO + O2 → 2 CO2
is started with a 1.0 M solution of CO2, 0.60 M CO will be present at equilibrium.
- Calculate the equilibrium constant.
- How much CO2 must be added to 1.0 L of this solution in order to obtain 1.0 mole of CO at equilibrium?
- How much O2 must be removed from 1.0 L of the original solution in order to lower the concentration of CO2 to 0.20 M?
- Consider the reaction of SiO2 with carbon.
- Write an equation for the reaction. Include the states of all species at room temperature.
- Give the structure of SiO2.
- When the reaction is carried out in a 1.0 L flask and 40 g of SiO2 are heated to some temperature with 12 g carbon, 0.10 mole of CO2 is obtained at equilibrium. Calculate the equilibrium constant.
- If 0.10 mole of CO2 were added to this equilibrium mixture what would the equilibrium amount of carbon and CO2 be?