Answer
a. $$ 0.0587 \space mole$$
b. $$ 0.0312 \space mole$$
c. $$ 3.97 \times 10^{-3} \space mole$$
Work Step by Step
a. - Using the molar mass as a conversion factor, find the amount in moles:
$$ 1.00 \space g \times \frac{1 \space mole}{ 17.03 \space g} = 0.0587 \space mole$$
b. $$ 1.00 \space g \times \frac{1 \space mole}{ 32.05 \space g} = 0.0312 \space mole$$
c. $$ 1.00 \space g \times \frac{1 \space mole}{ 252.08 \space g} = 3.97 \times 10^{-3} \space mole$$