Answer:
+15.8°
Explanation:
The formula for the observed rotation (α) of an optically active sample is
α = [α]lc
where
l = the cell path length in decimetres
c = the concentration in units of g/100 mL
[α] = the specific rotation in degrees
1. Convert the concentration to units of g/100 mL
[tex]c = \frac{\text{0.119 g}}{\text{10.0 mL}} \times \frac{10 }{10 } =\frac{\text{1.19 g}}{\text{100 mL}}[/tex]
2. Calculate the observed rotation
[tex]\alpha = (+13.3 ^{\circ}) \times 1.19 \times 1 = +15.8^{\circ}[/tex]
