Chemistry

posted by .

Solutions are made that contain 0.1 moles of each of the following compounds below in 100 g of H2O. Choose the compound whose solution will have the lowest freezing point.

NaBr
MgCl2----
KClO3
CO2
MgSO4


I know the answer is MgCl2
but I don't know how to get it. I know I have to use a periodic table but don't see the solution please explain

  • Chemistry -

    The secret is remembering a little emphasized point when these problems are worked. That point is---"the extent to which these thing happen depends SOLELY on the number of dissolved particles."
    So how many particles do we get when NaCl dissolves.
    NaCl ==> Na^+ + Cl^- = 2.
    MgCl2 ==> Mg^+2 + 2Cl^- = 3
    KClO3 ==> K^+ + ClO3^- = 2
    CO2 ==> doesn't dissolve to an appreciable extent and what little dissolves doesn't produce many ions so let's call this zero.
    MgSO4 ==> Mg^+2 + SO4^-2 = 2
    So which one produces the largest number of particles (all of them are the same molality). That would be MgCl2.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    intermolecular forces Rank the following substance from highest melting point to lowest melting point. My teacher gave a list of compounds: H2O, NO2,F2,CI2 and to have a high melting point means that you need a stronger IMF. Rank the …
  2. Chemistry

    Which aqueous solution has a freezing point closer to its predicted value 0.01 m NaBr or 0.01 m MgCl2?
  3. chemistry

    Soutions are made that contain 0.1 moles of each of the following compunds below in 100 of H2O. Choose the compounds whose solutions will have the lowest freezing point. A)MgCl2 B)MgSO4 C)KClO3 D)CO2 E)NaBr
  4. Chemistry

    Some physical properties of water are shown below. freezing point 0.00°C boiling point 100.00°C Kf 1.86°C/m Kb 0.512°C/m A 16.0 g sample of a compound known to contain 3 ion species is dissolved in 100. g of water. The boiling …
  5. Chemistry

    A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment, 0.1107 g of the compound was dissolved in 25.0 g of water. This solution had a …
  6. Chemistry

    A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00 g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment 0.1107g of the compound was dissolved in 25.0 g of water. This solution had a freezing …
  7. Chemistry

    Solutions are made that contain 0.1 moles of each of the following compounds below in 100g of H20. Choose the compound whose solution will have the lowest freezing point?
  8. Chemistry

    40.0 g of magnesium chloride (MgCl2) in 250.0 g of water at 22 °C.Calculate a) the vapor pressure of this solution, b) the freezing point, c) the boiling point. I know it is something like this, but I continue to get the incorrect …
  9. Chemistry

    A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment, 0.1107 g of the compound was dissolved in 25.0 g of water. This solution had a …
  10. chemistry

    Calculate (a) the moles and (b) the mass of magnesium carbonate at the start if 0.2 moles of sulfuric acid is added to the magnesium carbonate and the excess sulfuric acid made up to a 250 cm3 solution. 25 cm3 of this solution required …

More Similar Questions