Question

Calculate the mass of ascorbic acid to be dissolved in 75g of acetic acid to lower its melting point by 1.5 degree c

Answer 1

Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. Kf = 3.9 K kg mol−1.
Solution
Given that
Mass of acetic acid, w1 = 75 g
Molar mass of ascorbic acid (C6H8O6), M2 = 6 × 12 + 8 × 1 + 6 × 16 = 176 g mol−1
Lowering of melting point, ∆Tf = 1.5 K
Use same formula again we get,

(see my picture for a detail understand)

w2= 5.08 g
Answer
Required mass o ascorbic acid =5.08 g

Answer 2

mass of acetic acid,=75 g

ur solution is in above pic.