E5-Ideal Gas Prelab - If the barometric pressure in the lab...

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EXPERIMENT 5: Stoichiometry and the Ideal Gas Law Write the answers to these pre-laboratory questions in your lab notebook. Answers to these questions are due at the beginning of your lab section during the week of October 4-6 (for students with Monday, Tuesday, and Wednesday lab sections) or October 14-15 (for those with Thursday and Friday lab sections), as indicated on the Schedule of Experiments. Note: The ideal gas law is discussed in Chapter 6 of Petrucci. You might find it useful to look at sections 6.3-6.6. Pre-laboratory Questions: 1. Write the experiment title and purpose in your lab notebook. 2. A helium gas cylinder of the sort used to fill balloons has a volume of 63.8 L and a pressure of 148 atm at 22.5 o C. How many moles of helium are in the tank? 3. How many grams of potassium chlorate decompose to form potassium chloride and 788 mL O 2 at 128 o C and 748 torr? 2 KClO 3 ( s ) 2 KCl( s ) + 3 O 2 ( g ) 4. How will you determine the temperature of the nitrogen gas produced in this experiment? 5.
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Unformatted text preview: If the barometric pressure in the lab is 747 mmHg and the temperature of the nitrogen gas is 22.3 o C, what is the pressure of the nitrogen gas? 6. There are two ways in which the volume of nitrogen gas produced in this experiment can be determined. One is by direct measurement of the volume of displaced water in the 600 mL beaker. The other is by determining the mass of the displaced water; this mass divided by the density of water gives the volume of water displaced. Which of these methods is more precise? Explain your reasoning. You should use the more precise method in your experimental procedure. 7. Why must the mass of the nitrite salt be determined in this experiment? How will you determine this mass? 8. Why is it important to react the nitrite salt solution in the vial with the sulfamic acid solution in small amounts? 9. Sketch out a tentative experimental procedure. This procedure need not be overly detailed; a few sentences or an outline should suffice....
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This note was uploaded on 01/19/2011 for the course CHEM 2007 at Cornell University (Engineering School).

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