Quiz Grade _________         Quiz 5       Recitation Section ____
February 23, 1996                CHM 1045 -- 8:00 am -- Dr. Light
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(6)1.The formation of CaCO3(s) from CO2(g) and Ca(OH)2(s) is an
     exothermic process, proceeding as follows with a þH of
     reaction of -113.2 kJ/mol:

     Ca(OH)2(s)   +    CO2(g)  ---->   CaCO3(s)   +    H2O(l)

     Given the following heats of formation:

     substance      þHof (kJ/mol)  substance      þHof (kJ/mol)
      CaCO3(s)       -1207.1        CO2(g)         - 393.5
      CaO(s)         - 635.5        H2O(l)         - 285.9

     Use Hess's Law to calculate þHof for Ca(OH)2(s).  Show your
     work.






















(4)2.Calculate both the wavelength and energy of a photon of
     electromagnetic radiation which has a frequency of 
     4.63 x 1012 Hz.  (h = 6.63 x 10-34 J-s; c = 3.00 x 108 m/s)