[stuckinmud]

Hi, i'm really sorry I couldn't split these questions up and give you a better subject, but i'm just getting into chem and hardly know what the topics are called.  Anyway, here are some problems i've been working on with the answers in bold.  I would owe a great deal of gratitude to anyone that had the time to check over them for me.  thanks in advance for any help.

1.   Circle the mixture you expect to be better able to form a solution.
a.   KClO3 (s) + H20 (l)
b.   KClO3 (s) + C6H12 (l) (cyclohexane)
2.   Explain your choice for question 1.  Why do you think so?
Like dissolves like.  An ionic substance is closer to a polar solvent than a nonpolar one.
4.   Predict the number of grams of lithium carbonate that must be added to 10 kg of water in order to lower the freezing point of the solution to 263 K?
1.340grams
      7.   Which of the following factors favors the solubility of an ionic solid in a liquid    solvent?
   a.   a large magnitude for the solvation energy of the ions
   b.   a small magnitude fort eh lattice energy of the crystal
   c.   a solvent with a high polarity
   d.   all of the above
   e.   none of the above, they all favor the solid remaining undissolved
8.   A sample of steam under normal atmospheric pressure, initially at T=121.3C was placed in a freezer compartment and allowed to cool under constant pressure to a temperature of T=-24.2C.
   a.  Does the sample absorb of release heat during the process
            absorbs heat
   b. Calculate this amount of heat energy
          I don’t think I’m right.  I got    9156.16 J
9.   If we dissolve the same amount of the same solute in several different solvents, we find that the magnitude of the colligative property changes (∆TF, ∆TB, ∆ vp) are different in each solvent even though the concentration of solute is the same.
   a. What is responsible for the differences?
Intermolecular forces between the solvents and the solute is what accounts for this.  H-bonding, van der waals.


10.   In the preparation of a solution of sodium sulfate, 28.4grams of the salt were dissolved in enough water to make 1L of aqueous solution.
   a. What is the molatrity of the solution?
           0.2 Molar
   b. If the mass of the final solution is 1018.0g, what is its molal concentration
          1.96 x 10-4
   c. Finally, calculate the weight percent of sodium sulfate in such a solution.
          2.78 %
19.   Write the complete Rate Law for the reaction
   
Rate = d[C] =  -Kt
         dt