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General Chemistry - Midterm 1 2008

# General Chemistry - Midterm 1 2008 - Dr Rashmi...

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September 29, 2008 Dr. Rashmi Venkateswaran CHM 1301 and CHM 1311 B GENERAL CHEMISTRY QUIZ 1 STUDENT NAME STUDENT ID. No. DEMONSTRATOR’S NAME: LAB SECTION: 1 2 3 4 5 6 7 8 9 10 CONSTANTS R = 8.314 J/molK = 0.08206 L atm/molK 1 atm = 760 Torr = 101.325 kPa = 1.01325 x 10 5 Pa N A = 6.022 x 10 23 mol -1 There are 9 pages in this quiz including the cover page and the periodic table. Check and ensure you have answered each question before handing in the quiz. PLEASE use a pen!! Box, underline or highlight your FINAL answer. The quiz is out of 50 points CLEARLY explain your thinking… USE UNITS!

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A 34.8 mL sample of an unknown, water-insoluble gas was collected over water at 22.6 °C and a barometric pressure of 0.895 atm. When the gas was dried and chilled, it formed 114.6 mg of liquid. What was the molar mass of this substance? [Vapor pressure of water at 22.6 °C is 20. mmHg] (10) Suggest a possible identity for the unknown substance.
Calculate the mass , in grams, and the volume , in litres, of H 2 (g) (measured at 22.0 °C and 745 mmHg) required to react with 30.0 L CO(g) (measured at STP) in the reaction CO(g) + H 2 (g) C 3 H 8 (g) + H 2 O(l) (10)

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A container of volume 2.00 L is filled with an unknown gas to a pressure of
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