Chapter 3

Nail polish remover is usually the volatile liquid ethyl acetate, \(\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5} .\) In this compound, what is the (a) atom ratio of \(\mathrm{C}\) to \(\mathrm{O}\) ? (c) atom ratio of \(\mathrm{C}\) to \(\mathrm{H}\) ? (b) mole ratio of \(\mathrm{C}\) to \(\mathrm{O}\) ? (d) mole ratio of \(\mathrm{C}\) to \(\mathrm{H}\) ?

How many moles of \(\mathrm{Bi}\) atoms are needed to combine with \(1.58 \mathrm{~mol}\) of \(\mathrm{O}\) atoms to make \(\mathrm{Bi}_{2} \mathrm{O}_{3}\) ?

How many moles of vanadium atoms, \(\mathrm{V},\) are needed to combine with 0.565 mol of \(\mathrm{O}\) atoms to make vanadium pentoxide, \(\mathrm{V}_{2} \mathrm{O}_{5} ?\)

How many moles of \(\mathrm{Cr}\) are in \(2.16 \mathrm{~mol}\) of \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) ?

How many moles of \(\mathrm{O}\) atoms are in \(4.25 \mathrm{~mol}\) of calcium carbonate, \(\mathrm{CaCO}_{3}\), the chief constituent of seashells?

Aluminum sulfate, \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\), is a compound used in sewage treatment plants to remove pollutants by causing them to precipitate. (a) Construct a pair of conversion factors that relate moles of aluminum to moles of sulfur for this compound. (b) Construct a pair of conversion factors that relate moles of sulfur to moles of \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\). (c) How many moles of \(\mathrm{Al}\) are in a sample of this compound if the sample also contains \(0.900 \mathrm{~mol} \mathrm{~S} ?\) (d) How many moles of \(S\) are in \(1.16 \mathrm{~mol} \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) ?

How many moles of \(S\) are needed to combine with 0.225 mol Al to give \(\mathrm{Al}_{2} \mathrm{~S}_{3}\) ?

How many moles of \(\mathrm{UF}_{6}\) would have to be decomposed to provide enough fluorine to prepare \(1.25 \mathrm{~mol}\) of \(\mathrm{CF}_{4} ?\) (Assume sufficient carbon is available.)

How many moles of \(\mathrm{Fe}_{3} \mathrm{O}_{4}\) are required to supply enough iron to prepare \(0.260 \mathrm{~mol} \mathrm{Fe}_{2} \mathrm{O}_{3}\) ? (Assume sufficient oxygen is available.)

How many atoms of carbon are combined with 4.13 moles of hydrogen atoms in a sample of the compound propane, \(\mathrm{C}_{3} \mathrm{H}_{8} ?\) (Propane is used as the fuel in gas barbecues.)