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Chemistry 2000, Fall 96, Test 3

Answer any five questions.

  1. The solubility product of nickel (II) sulfide (NiS) at tex2html_wrap_inline160 is tex2html_wrap_inline162 and its molar mass is 90.76g/mol. What is the solubility of nickel sulfide in g/L?
  2. At 298K, the pH of a saturated solution of copper (II) hydroxide ( tex2html_wrap_inline164 ) is 7.5. What is tex2html_wrap_inline166 ?
  3. A 310g piece of iron (specific heat capacity tex2html_wrap_inline168 ) is packed in ice at tex2html_wrap_inline170 . When equilibrium is reached (i.e. when the temperature of the iron is equal to the temperature of the ice), 15g of ice have melted. What was the initial temperature of the iron? The heat of melting of ice is 6.01kJ/mol and the molar mass of water is 18.02g/mol.
  4. For the reaction

    displaymath172

    tex2html_wrap_inline174 at 298K. What is the standard free energy of formation of tex2html_wrap_inline176 ?

    1. Calculate tex2html_wrap_inline178 at 298K for the reaction

      displaymath180

    2. Calculate tex2html_wrap_inline178 at 350K for the same reaction.
  6. In a solution containing 0.4mol/L of tex2html_wrap_inline184 , 0.3mol/L of tex2html_wrap_inline186 , 0.03mol/L of tex2html_wrap_inline188 and tex2html_wrap_inline190 of tex2html_wrap_inline192 at 298K, is the reaction

    displaymath194

    spontaneous?


Marc Roussel
Thu Nov 21 13:41:19 MST 1996