Answer
The patient receives 0.50 g of $CaCl_2$
Work Step by Step
1. Use the definition of percent (m/v) to calculate the mass of $CaCl_2$.
$10.\%$ (m/v) $ CaCl_2 $ solution : $$ 10. \space g \space CaCl_2 = 100 \space mL \space solution$$
$$5.0 \space mL \space solution \times \frac{10. \space g \space CaCl_2}{100 \space mL \space solution} = 0.50 \space g \space CaCl_2 $$
