Quiz Grade _________         Quiz 9       Recitation Section ____
April 5, 1996                    CHM 1045 -- 8:00 am -- Dr. Light
     Names           SSN                Names          SSN

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Note:  R = 0.08206 L-atm/mol-K

(4)1.A tank of oxygen gas has a volume of 42.3 L and at 25 oC
     registers a pressure of 32.5 atmospheres.  How many grams of
     oxygen are contained in the tank?  














(6)2.Oxygen can be formed in the laboratory by heating potassium
     chlorate as follows:

     2 KClO3(s)  ---->  2 KCl(s)   +   3 O2(g)

     A total of 212 mL of oxygen was collected over water at 25oC
     (where vapor pressure of water = 23.76 torr).  The barometer
     on the wall said the atmospheric pressure was 745 torr.

     (a)  How many moles of O2 were produced?
     (b)  How many grams of KClO3 were used?