Last modified: Fri 03/20/2015 12:21:17 pm
BCE

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


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1. How many moles of oxygen, O2, does a 15.0 L container hold if the pressure exerted by the gas is 530 mmHg and the temperature is 27 degrees Celsius?

mol

2. In the reaction

2Mg(s) + O2(g)----> 2MgO(s)

how many moles of magnesium react per mol of O2?

mol

3. How many moles of magnesium would react with the moles of oxygen you calculated in Q1?

mol

4. A 22.4 L container contains 1 mol of helium at 1 atmosphere and 273 K. If another mol of helium is added to the container and the volume and the temperature are held constant, what is the total pressure in the container?

atm

5a. A 22.4 L container contains 1 mol of helium at 1 atmosphere and 273 K. If a mol of carbon dioxide is added to the container and the volume and the temperature are held constant, what is the total pressure in the container?

atm

b) What is the pressure due to the helium in the mixture?

atm

c) What is the pressure due to the carbon dioxide in the mixture?

atm

6. In the animation below potassium chlorate is heated to produce oxygen gas which is bubbled into a graduated cylinder completely filled with water. Watch the animation and then answer the question below. (NOTE: The movie is available at the following site.)

After watching the animation describe what you observed and indicate the gas(es) that are in the tube above the water.

If the total pressure exerted by the gases in the cylinder is 750. mmHg and the pressure due to the water in the vapor phase is 23.5 mmHg, what is the pressure due to the oxygen gas?

mmHg

7. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

8. If there is one question you would like to have answered in lecture, what would that question be?