105a_parr_2008_summer_exam_2_key_7_11

105a_parr_2008_summer_exam_2_key_7_11 - 7(10 pt A bottle...

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7. (10 pt) A bottle with a volume of 4.25 L is filled with xenon gas at STP. A small piece of dry ice (solid CO 2 ), weighing 2.75 g, is dropped into this bottle. a. When the dry ice evaporates, what is the partial pressure of CO 2 in the bottle? (Assume no change in temperature.) b. What is the total pressure of the gaseous mixture inside the bottle after the dry ice has evaporated? c. What is the mole fraction of CO 2 in the bottle after the dry ice has evaporated? d. What is the mass percent of CO 2 in the bottle after the dry ice has evaporated?
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8. (12 pt) The density of molecular phosphorous vapor at 300 o C and 1.00 atm is 2.64 g/L. a. What is the molar mass of the phosphorous molecule? b. What is the molecular formula of the phosphorous compound? c. At what temperature will its density be 2.00 g/L, provided the pressure remains constant?
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9. (6 pt) At what temperature will hydrogen molecules have the same root mean square velocity as nitrogen molecules at 35 o C?
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10. (14 pt) A sample of ethylene gas (C 2 H 4 ) has a volume of 18.0 L at 300 K and 1.50 atm is
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105a_parr_2008_summer_exam_2_key_7_11 - 7(10 pt A bottle...

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