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Chemical reaction in a closed container

Page history last edited by Joe Redish 6 years, 1 month ago

7.2.2.P4

 

A gas of potassium chlorate molecules KClO3 all decompose into potassium chloride, KCl, and diatomic oxygen, O2. The products and reactants are in a closed container and can all be treated as ideal gases.

 

A. Fill in the smallest possible integers that allows the stoichiometry of the reaction equation to be correct:

__ KClO3 → ___ KCl + ___ O2

 

B. If there are N molecules of potassium chlorate in the initial state, how many product molecules are there?

 

C. For each of the following conditions on the reaction, select "increases, decreases, remains the same, or not enough information given in the problem to decide" that makes the statement correct.

  1. If the reaction takes place as a constant temperature and volume, the pressure ____
  2. If the reaction takes place at a constant temperature and pressure, the volume ____
  3. If the reaction takes place at a constant volume in a thermally insulated container that allows no heat exchange with the outside world (or the container), the gas temperature _____

 

Explain why you chose the answer you did. If you chose "not enough information", indicate what you would need to know in order to answer.

 

D. For each of the following conditions on the reaction, select "positive, negative, zero, or not enough information given in the problem to decide" that makes the statement correct.

  1. If the reaction takes place as a constant temperature and volume, the work done by the gas on the outside world is ____
  2. If the reaction takes place at a constant temperature and pressure, the work done by the gas on the outside world is ____
  3. If the reaction takes place at a constant volume in a thermally insulated container that allows no heat exchange with the outside world (or the container), the work done by the gas on the outside world is _____

 

Explain why you chose the answer you did. If you chose "not enough information", indicate what you would need to know in order to answer.

 

Bill Dorland and Joe Redish 1/30/18 

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