Question

When 20g of a non – volatile solid is added to 250 ml of water, the freezing point of water
becomes -0.9 0 C. Calculate molecular mass of the solid if K f of water is 1.86Kkg/mol.

Answer 1

Answer:

molecular mass is 165.33 gm

Explanation:

here, kf is 1.86kkg/mol

depression in freezing point is 0.9

volume of water is 250 ml

using, ∆Tf = 1000Kf n/ W

0.9= 1000× 1.86× 20/ m 250

m= 165.33