Overview
complete the answer to the chemistry questions in the pdf file attached( total 23 questions)
some questions include;
1. Determine ΔHvap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K
2. Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d =
0.792 g/mL) and 387 mL of CH3CH2CH2OH (d = 0.811 g/mL)
3. Determine the normal boiling point of a substance whose vapour pressure is 55.1 mm Hg at 35°C and has a ΔHvap of 32.1 kJ/mol.
4. Determine the vapor pressure (in mm Hg) of a substance at 29°C, whose normal boiling point is 76°C and has a ΔHvap of 38.7 kJ/mol.
5.16. The boiling point of an aqueous 1.83 m (NH4)2SO4 (molar mass = 132.15 g/mol)
solution is 102.5°C. Determine the value of the van't Hoff factor for this solute if the Kb
for water is 0.512°C/m.
6.23. Which cation in each set is expected to have the larger (more negative) hydration energy?
Explain. (4 points)
I Be2+ or Ca2+
II Rb+ or Zn2+
7. A solution is prepared by dissolving 91.7 g fructose in 545 g of water. Determine the
mole fraction of fructose if the final volume of the solution is 576 mL. (MM fructose =
180.16 g/mol)