Question

what is difference between henry's law and raoult's law.? and also what is partial pressure of a substance.?

Answer 1

Henry's law states that "at a given temperature the partial pressure of the gas in vapour phase(p) is proportional to the mole fraction of the gas in the solution.

Raoult's law states that "at a given temperature the relative lowering of vapour pressure of dilute solution containing non-volatile solute is equal to the mole fraction of solute.

Answer 2

Henry's Law tends to approximate real behavior for the solute (i.e., lower concentration) at a very low concentration while Raoult's Lawtends to approximate real behavior for the solvent in a dilute solution. They are both limit cases of an underlying binary vapor-liquid equilibrium relationship.