Question 13                                                    2.25 / 3 pts

For the following UNBALANCED exothermic reaction, match the shift to the causal agent:

 

 

 

Increase in pressure                                Shift to products

Increase in Temperature                          Shift to reactants

Addition of a Catalyst                              No shit

Increase in volume                                  Shift to products

 

Question 11                                                     0/1 pts

At 427°C, a 5.0 L flask contains 20.0 moles of HCI, 18.0 moles of , 12.0 mol of , and 5.9 moles of water vapor at equilibrium. Calculate the for the reaction:

 

0.1967

You can get the concentrations (in M) for each substance by dividing the moles of an individual substance by the vessel volume.

The decomposition of ammonium carbamate (NH4CO2NH2) is described in the reaction below: NH4CO2NH2 (s) 2NH3 (g) + CO2 (g) endothermic reaction A 9.407 g sample of NH4CO2NH2 (s) is placed in an evacuated (ie. initial pressure is 0 atm) 4.000 L vessel at 24°C. After equilibrium has been established, the total pressure of the system is 0.318 atm. Some NH4CO2NH2 (s) remains in the vessel. Show work and give answers to the correct number of significant figures.

a) What is the equilibrium partial pressure of NH3 (g) and CO2 (g), respectively?

b) Calculate the KP for the reaction.

c) Calculate the number of moles of NH4CO2NH2 (s) initially. Course: CHEM 1F92 (01, 02) Wednesday, August 31, 2016 Page 5 of 31 Question 2. (continued)

d) Calculate the number of moles of NH3 (g) at equilibrium.

e) What mole fraction of NH4CO2NH2 (s) has been decomposed to NH3 (g)? Report answer in percentage (%).

f) If the volume of the vessel were doubled at constant temperature, which direction would equilibrium shift? Circle the correct answer Shift to Products or Shift to Reactant

g) If the temperature of the system is increased at constant volume, which direction would equilibrium shift? Circle the correct answer. Shift to Products or Shift to Reactant

Write the equilibrium constant expression for the following reaction. Note: you can make subscripts in word by using the Ctrl and the =; superscripts are made by Ctrl, Shift, =.

N₂ + 3H₂ Ã 2NH₃

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State the Le Chatelier’s Principle

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