Environmental Chemistry Assignment | Professional Essay Writers
February 25th, 2020
1. Colligative properties.
a. Explain the origin of colligative properties. Why do they not depend on the chemical identity of the solute? (Atkins 3.7)
b. Estimate the vapor pressure of seawater at 20°C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Nat and Clions, each present at about 0.5 mol/dm. (Atkins 3.29)
c. Calculate the mole fraction of carbon dioxide in fat given that the Henry’s law constant is 8.6×109 Torr and the partial pressure of carbon dioxide is 55 kPa. (Atkins 3.32)
d. Estimate the freezing point of 150 mL of water containing 7.5 g of sucrose. (Atkins 3.35)
e. Water has K3=0.51 K kg moll. What is the boiling temperature of a 1 M solution of NaCl?
f. 4.5 g of a non-dissociating substance when dissolved in 125 g CCl4 leads to an elevation of the boiling point of 0.65 K. Calculate the freezing point depression, the molecular mass of the substance, and the factor by which the vapor pressure of CCl4 is lowered. Note, for CCl4, the equilibrium freezing temperature is 250.3 K, the freezing point depression constant Kris 30 K kg/mol, the boiling temperature is 349.8 K, and the boiling point elevation constant KB is 4.95 K kg/mol. Get Chemistry help Today