# aaaa - October 2 2006 Dr Rashmi Venkateswaran CHM 1301 and...

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October 2, 2006 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 CONSTANTS R = 8.314 J/molK = 0.08206 L atm/molK 1 atm = 760 Torr = 101.325 kPa N A = 6.022 x 10 23 mol -1 1 cal = 4.184 J ; 1 Cal = 1000 cal There are 8 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 40 points CLEARLY explain your thinking… USE UNITS!

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A miniature volcano can be made in the laboratory with ammonium dichromate. When ignited, it decomposes in a fiery display according to the reaction: (NH 4 ) 2 Cr 2 O 7 (s) N 2 (g) + 4 H 2 O (g) + Cr 2 O 3 (s) If 0.95 g of ammonium dichromate is used, and if the gases from this reaction are trapped in a 15.0 L flask at 23 ° C, a) what is the total pressure of the gas in the flask in Torr? (8) b) what are the partial pressures of N 2 and H 2 O in Torr?
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