You can use mass percent composition as a conversion factor between grams of a constituent element and grams of the compound. Write the conversion factor (including units) inherent in each mass percent composition.
(a) Water is $11.19 \%$ hydrogen by mass.
(b) Fructose, also known as fruit sugar, is $53.29 \%$ oxygen by mass.
(c) Octane, a component of gasoline, is $84.12 \%$ carbon by mass.
(d) Ethanol, the alcohol in alcoholic beverages, is $52.14 \%$ carbon by mass.