Answer
a.
$$3.54 \times 10^{22} \space molecules $$
b.
$$ 1.88 \times 10^{22} \space molecules $$
c.
$$ 2.39 \times 10^{21} \space molecules $$
Work Step by Step
a.
- Using the molar mass as a conversion factor, find the amount in moles:
$$ 1.00 \space g \times \frac{1 \space mole}{ 17.03 \space g} = 0.0587\underline{2} \space mole$$
$$ 0.0587\underline{2} \space mole \space \times \frac{6.02 \times 10^{23} \space molecules }{1 \space mole} = 3.54 \times 10^{22} \space molecules $$
b. - Using the molar mass as a conversion factor, find the amount in moles:
$$ 1.00 \space g \times \frac{1 \space mole}{ 32.05 \space g} = 0.0312 \space mole$$
$$ 0.0312 \space mole \space \times \frac{6.02 \times 10^{23} \space molecules }{1 \space mole} = 1.88 \times 10^{22} \space molecules $$
c. - Using the molar mass as a conversion factor, find the amount in moles:
$$ 1.00 \space g \times \frac{1 \space mole}{ 252.08 \space g} = 0.00397 \space mole$$
$$ 0.00397 \space mole \space \times \frac{6.02 \times 10^{23} \space molecules }{1 \space mole} = 2.39 \times 10^{21} \space molecules $$
