CHM 1046                      QUIZ  3               September 13, 1996


     This quiz is take-home and open book, and it is intended that
all members of the group contribute to completing it.  Only one
copy is to be submitted by the group, and all members who
participated should sign their names below.  Test is due by start
of class on Monday, September 16.

                   List names in alphabetical order!

_______________________  _______________________

_______________________  _______________________

_______________________  _______________________

Points

1.    A commercial reagent bottle of concentrated HNO3 says that the
      concentration is 68% HNO3 with a specific gravity of 1.41
      g/mL.

(4)   (a)  What is the molarity (M) of this solution?












(4)   (b)  What is the molality (m) of this solution?











(4)   (c)  What is the mole fraction (X) of HNO3 in this solution?










(4)2. A 25 mL sample of well water from a farm was found to contain
      23.2 micrograms of ethylene dibromide (C2H4Br2).  What is the
      ethylene dibromide concentration when expressed in
      
      (a) parts per million (ppm)?





      (b) parts per billion (ppb)?





(4)3. Water has a vapor pressure of 525.8 torr at 90 oC.  What would
      be the vapor pressure at this temperature of a solution of 25
      g of urea (molecular weight = 60 g/mol, non-dissociating in
      solution) in 175 g of water?