SELECT * FROM question_mgmt as q WHERE id=1778 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=57 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

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.

Answer:

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, ΔTf = 1.5 K

We know that:

 

=  (1.5 x 176 x 75) / (3.9 x 1000)

 

= 5.08 g (approx)

Hence, 5.08 g of ascorbic acid is needed to be dissolved.


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