Answer
a. $2.839*10^{-3}\text{ moles}$
b. $1.71*10^{21}\text{ molecules}$
Work Step by Step
a. $0.5000\text{ grams}*\frac{1\text{ mol}}{176.12412\text{ grams}}=2.839*10^{-3}\text{ moles}$
b. $0.5000\text{ grams}*\frac{1\text{ mol}}{176.12412\text{ grams}}*\frac{6.0221*10^{23}\text{ molecules}}{1\text{ mol}}=1.71*10^{21}\text{ molecules}$
