chemistry

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I have the answers, I am just interested in the formulas so that I can solve the problems, thanks!

1. Find the boiling point of a solution composed of 110g of HgCl2 (a non-ionizing solute) in 175g of water.

2. Find the freezing point of a solution composed of 50g IBr in 120 g of water. Assume 100% ionization. KBr = k1+Br1-.

3. Find the freezing point of solution composed of 74.15g MG(NO3)2 in 90 g of water. Assume 100% ionization.

4. Calculate the freezing point of a solution containing 12.0g of sucrose (C12H22O11) in 120g of water.

5. Calculate the boiling point of a solution containing 42.00 g of CuSO4 in 300g of water. CuSO4=Cu2+ + SO42-.

6. Find the molecular mass of a non-ionizing solute if 72g dissolved in 300g of water raise the boiling point to 100.860 degrees Celsius.

7. Find the molecular mass of a non-ionizing solute if 87.85g dissolved in 500g of water lower the freezing point to -3.00 degrees Celsius.

  • chemistry -

    1. Find the boiling point of a solution composed of 110g of HgCl2 (a non-ionizing solute) in 175g of water.


    mols HgCl2 = grams/molar mass
    Substitute and solve for mols.

    molality = m = mols/Kg solvent
    Substitute and solve for m

    delta T = i*Kb*m
    Your post says i = 1
    Kb = 1.51
    Substitute and solve for delta T, then add to 100 C to find the new boiling point.

  • chemistry -

    2. Find the freezing point of a solution composed of 50g IBr in 120 g of water. Assume 100% ionization. KBr = k1+Br1-.

    I assume you made a typo and IBr really is KBr.
    mols KBr = grams/molar mass.
    Solve for mols.

    molality = m = mols/kg solvent
    Solve for m

    delta T = i*Kf*m
    i for KBr = 2
    Kf = 1.86
    Solve for delta T and subtract from 0 C to find the new freezing point.
    delta T = i*Kf*m
    i = 1

  • chemistry -

    3,5,5 look just like 1 and 2.
    6 and 7 are done by working backward.
    delta T = i*Kf or Kb *m
    You're given delta T, solve for m.

    Then m = mols/kg solvent.
    Solve for mols

    Then mols = grams/molar mass. You're given mols and grams; solve for molar mass.
    i = 1 for both 6 and 7

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