ex01_day09wks_explanations - Worksheet Key Friday,...

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Unformatted text preview: Worksheet Key Friday, September 10, 2010 9:11 PM Worksheet: Gases Name: __________________________ UTEID: ___________________ Complete the following problems in class. You may do the work on the back or on an attached paper. 1. Hydrogen‐oxygen balloons create quite a thundering “pop” when ignited. Mariella observed that balloons with hydrogen as the limiting reactant (but still with as close a 2:1 ratio as possible) tended to pop more loudly than those with oxygen as the limiting reactant. Jose decides to ready a balloon for reaction. Using conditions of STP, he imparts 0.18 L of oxygen and 0.40 L of hydrogen to a balloon. Identify the limiting reactant, the amount of water VAPOR formed, and the amount of reactant left over at the conclusion of the explosion. Limiting reactant is Amount of water VAPOR formed: Amount of reactant left over: _______________________________ 2. A large flask is evacuated and found to weigh 134.567 g. It is then filled to a pressure of 735 torr at 31oC with a gas of unknown molar mass and then reweighted; its mass is 137.456g. The flask is then filled with water and again weighed; its mass is now 1067.9 g. Assuming that the ideal gas equation applies, what is the molar mass of the unknown gas? (The density of water at 31oC is 0.997 g/cm3.) Molar mass is: ________________________________ Exam01 Materials Page 1 Exam01 Materials Page 2 3. An aerosol spray can with a volume of 325 mL contains 3.0 g of propane as propellant. What is the pressure in atm of the gas in the can at 28oC? The pressure of the gas is ___________________________ 4. A 0.50‐mol sample of oxygen gas is confined at 0oC in a cylinder with a movable piston. The gas has an initial pressure of 1.0 atm. The gas is then compressed by the piston so that its final volume is half the initial volume. The final pressure of the gas is 2.2 atm. What is the final temperature of the gas in degrees Celsius? The final temperature of the gas is _______________________________ Exam01 Materials Page 3 5. The industrial synthesis of nitric acid involves the reaction of nitrogen dioxide gas with water. If 20 L of water is allowed to react with 450 L of NO2 at a pressure of 5.00 atm and a temperature of 295 K, how many moles of nitric acid can be prepared? ______________________ moles of nitric acid can be prepared. Exam01 Materials Page 4 Exam01 Materials Page 5 ...
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This note was uploaded on 11/11/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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