0.615 g – 10 mL
X g – 100 mL
C = X = 0.615g × 100mL / 10mL = 6.15g (in 100mL).
[α]D20 = 100 α / (l × C) = 100 × (-1.7) / (0.5dm × 6.15g) = -55.28 ≈ -55.3.
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