Question

A solution containing 10 g per dm³ of urea (molar mass 60 g mol⁻¹) is isotonic with 5% solution of non-volatile solute, M_B of solute is:

Options

• 300 g mol⁻¹

• 350 g mol⁻¹

• 200 g mol⁻¹

• 250 g mol⁻¹

Answer 1

300 g mol⁻¹

Explanation:

`1/60 = 5/"x"`

x = 300 g mol⁻¹

1000 cm³ contains 10 g.

100 cm³ contains 1 g, i.e., 1%.