Answer
$[α]_{D^{25}} = -51^{\circ} $
Work Step by Step
We know,
$0.5g/10mL = 0.050g/mL$
$20mm = 2dm$
So,
$[α]_{D^{25}} = \frac{-5.1^{\circ}}{(0.050)(2)} = -51^{\circ} $ for (-)-epinephrine.
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