Vapour pressure of dilute aqueous solution of glucose is 750 mm of mercury at 373K. The mole fraction of solute is

Options

(a) 1/76
(b) 1/7.6
(c) 1/38
(d) 1/0.1

Correct Answer:

1/76

Explanation:

p(s) = p⁰(1 – x₂).

⇒ 750 = 760(1 – x₂) or 750/760 = 1 – x₂, or 750/760 -1 = -x₂

⇒ x₂ = 1/76.