110_Fa11_Ex3-A - CHEMISTRY 110 EXAM 3 NOVEMBER 7, 2011 FORM...

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Unformatted text preview: CHEMISTRY 110 EXAM 3 NOVEMBER 7, 2011 FORM A --------------------------------------------------------------------------------------------------------------------- 1. For an ideal gas, which graph best depicts the relationship between volume (on y-axis) and pressure (x-axis) at constant n and T? --------------------------------------------------------------------------------------------------------------------- 2. Consider a 22.4 L vessel at 273 K that is partitioned into two halves by a removable wall. The right half of the vessel contains 16 g O 2 . The left half of the vessel contains 14 g N 2 . What will be the final pressure of the system when the center wall is removed? A. 1.0 atm B. 2.0 atm C. 0.50 atm D. 0.75 atm E. 1.5 atm --------------------------------------------------------------------------------------------------------------------- 2 N 14 2 O 16 !" #" $" %" &" Removable Wall --------------------------------------------------------------------------------------------------------------------- 3. An aerosol spray can with a volume of 250 mL contains 2.30 g of propane gas (C 3 H 8 ) as a propellant. The can says that exposure to temperatures above 130 F (54.4 C) may cause the can to burst. What is the pressure in the can at this temperature? A. 5.61 atm B. 0.247 atm C. 4.67 atm D. 0.931 atm E. 2.23 atm --------------------------------------------------------------------------------------------------------------------- 4. A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture? A. 11.0 mols B. 5.00 mols C. 6.75 mols D. 9.25 mols E. 12.0 mols --------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------------- 5. Carbon monoxide is toxic to humans at high concentrations. At an atmospheric pressure of 0.984 atm and temperature of 23C, what is the partial pressure of CO at the toxic concentration of 667 ppm? A. 4.21 ! 10 3 atm B. 0.667 atm C. 3.99 ! 10 4 atm D. 8.74 ! 10 5 atm E. 6.56 ! 10 4 atm --------------------------------------------------------------------------------------------------------------------- 6. Ethanol melts at 114 o C and boils at 78 o C. Which of the following data is NOT needed to calculate the energy required to convert ethanol at 114 o C to a gas at 100 o C? A. Heat of fusion B. Heat of vaporization C. Specific heat of solid D. Specific heat of liquid E. Specific heat of gas --------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------------- 7. Which of the following are weak electrolytes?...
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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110_Fa11_Ex3-A - CHEMISTRY 110 EXAM 3 NOVEMBER 7, 2011 FORM...

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