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

Answer:

HOLA THERE!! HERE IS YOUR ANSWER///----

Explanation:

ASCORBIC ACID (Vitamin C, C6H8O6) let the mass be "a"

Kf of the solution is 3.9 K Kg/mol

mass of the acitic acid= 75g

MOLAR MASS OF THE ASCORBIC ACIDS IS 176 gm/mol

                                               Tf = 1.5 degree C (given)

again we know,

              ΔTf = Kf x M

          =>1.5  = 3.9 x ( a /175) x( 1000 / 75)

on sloving we are getting mass of ascorbic acid "a"

            => a = 5.078 gram (approx.) (ANSWER)

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Answer 2

Answer:

Explanation:

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