Problem on heat of vaporization and osmotic pressure

Question

Assignment:

Question 1. In the reaction CaO(s) + SO₂(g) YEILDS CaSO₃(s),

Which is correct:
O₂^- acts as a Lewis base, and SO₂ acts as a Lewis acid.
Ca²⁺ acts as a Lewis base, and SO₄^2- acts as a Lewis acid.
SO₄^2- acts as a Lewis base, and SO₂ acts as a Lewis acid.
SO₂ acts as a Lewis base, and O₂^- acts as a Lewis acid.
SO₂ acts as a Lewis base, and Ca²⁺ acts as a Lewis acid.

Question 2. Arrange the following substances in the order of increasing entropy at 25°C.
HF(g), NaF(s), SiF₄(g), SiH₄(g), Al(s)
lowest → highest

Question 3. The compound methylchloride, CH₃Cl, has a vapor pressure of 100 mmHg at 210 K and 10 mmHg at 181 K. Calculate the heat of vaporization of CH₃Cl using the Clausius-Clapeyron equation. (please put answer in J/mol) Explain in very simple terms.

Question 4. What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C₃H₇OH) dissolved in enough water to make 500. mL of solution at 27°C? (please put answer in atmospheres) Explain in very simple terms.

Provide complete and step by step solution for the question and show calculations and use formulas.