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If the percent hydrogen in a drop of water is \(11 \%,\) what is the percent hydrogen in a kilogram of water?

Lactose is a sugar found in milk. Calculate the percent composition of lactose, \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)

Benzoyl peroxide is the active ingredient in an acne cream. Calculate the percent composition of benzoyl peroxide, \(\mathrm{C}_{14} \mathrm{H}_{10} \mathrm{O}_{4}\)

Methionine is an essential amino acid in protein. Calculate the percent composition of methionine, \(\mathrm{C}_{5} \mathrm{H}_{11} \mathrm{NSO}_{2}\)

Monosodium glutamate (MSG) is added to food to enhance the flavor. Calculate the percent composition of MSG, \(\mathrm{NaC}_{5} \mathrm{H}_{8} \mathrm{NO}_{4}\)

Mercurochrome dissolved in water is a reddish liquid formerly used as an antiseptic. Calculate the percent composition of mercurochrome, \(\mathrm{HgNa}_{2} \mathrm{C}_{20} \mathrm{H}_{8} \mathrm{Br}_{2} \mathrm{O}_{6}\)

Chlorophyll is a dark green plant pigment. Calculate the percent composition of chlorophyll, \(\mathrm{C}_{55} \mathrm{H}_{70} \mathrm{MgN}_{4} \mathrm{O}_{6}\).

In an experiment \(0.500 \mathrm{~g}\) of tin reacted with nitric acid to give tin oxide. If the oxide had a mass of \(0.635 \mathrm{~g}\), what is the empirical formula of tin oxide?

In an experiment \(0.500 \mathrm{~g}\) of nickel reacted with air to give \(0.704 \mathrm{~g}\) of nickel oxide. What is the empirical formula of the oxide?

In an experiment \(2.410 \mathrm{~g}\) of copper oxide produced \(1.925 \mathrm{~g}\) of copper metal after heating with hydrogen gas. What is the empirical formula of copper oxide?