18. an equal number of moles of nacl and mgf2 are dissolved in equal volumes of water. which solution has the higher (6 points) a. boiling point b. vapor pressure c. freezing point + 2 extra points if you can explain why.

a. Boiling point: MgF₂ will have the higher boiling point.

b. Vapor pressure: NaCl will have the higher vapor pressure.

c. Freezing point: NaCl will have the higher freezing point.

Explanation:

MgF₂ will be ionized into 3 ions (1 of Mg²⁺, 2 of F⁻) while NaCl will be ionized into 2 ions (1 of Na⁺, 1 of Cl⁻).

So, MF₂ will cause elevation of boiling point, depression in vapor pressure, and depression of freezing point higher than the effect of NaCl.

Thus:

a. Boiling point: MgF₂ will have the higher boiling point.

b. Vapor pressure: NaCl will have the higher vapor pressure.

c. Freezing point: NaCl will have the higher freezing point.

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