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What mass of ascorbic acid (176 g/mol) in 75 g of acetic acid lowers its melting point by 1.5 C? (Kf = 3.9 K kg/mol)
A10.2 g
B2.54 g
C5.08 g
D3.38 g
Answer & Solution
Correct answer: C. 5.08 g
m = 1.5/3.9 = 0.385 mol/kg, so 0.0288 mol is needed in 0.075 kg, which is 0.0288 × 176 = 5.08 g.
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