$8 \text{ g} \times \frac{1 \text{ μg}}{1,000,000 \text{ g}} = 0.000008 \text{ μg}$

$8 \text{ g} \times \frac{1,000,000 \text{ μg}}{1 \text{ g}} = 8,000,000 \text{ μg}$

$8 \text{ g} \times \frac{1 \text{ g}}{1,000,000 \text{ μg}} = 0.000008 \text{ g}$

$8 \text{ g} \div 1,000,000 = 0.000008 \text{ μg}$