Question

(a) State the following:
(i) Henry’s law about partial pressure of a gas in a mixture.
(ii) Raoult’s law in its general form in reference to solutions.
(b) A solution prepared by dissolving 8.95 mg of a gene fragment in 35.0 mL of water has an osmotic pressure of 0.335 torr at 25°C. Assuming the gene fragment is a non-electrolyte, determine its molar mass.

Answer 1

(a) (i) Henry’s law: It states that the partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution and is expressed as:

P = K_H x

Where K_H is Henry’s law constant

(ii) Raoult’s law: It states that for any solution the partial pressure of each volatile component in the solution is directly proportional to its mole fraction.