Question

150g of an unknown molecular material was dissolved in 450g of water.

Answer 1

Answer:

182.35g/mol

Explanation:

Given mass of solute =w b` =15.0g

Molar mass of solute =M

b =?

Mass of water =wa =450g

Freezing point of water =0 A^oC =273K

Freezing point of solution =−0.34 A^o K

=(−0.34+273)K

Depression in freezing point =∈"T f =

273−(−0.34+273)=0.34K

K f for water = 1.86 K Kg mol −1