91Ó°ÊÓ

In 1871 Mendeleev predicted the undiscovered element ekasilicon. In 1886 the element was discovered in Germany and was given the name germanium. If \(0.500 \mathrm{~g}\) of germanium reacts with chlorine gas to give \(1.456 \mathrm{~g}\) of germanium chloride, what is its empirical formula?

Calculate the volume in milliliters occupied by one molecule of ethyl alcohol, \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH},\) in a beaker of alcohol. The density of ethyl alcohol is \(0.789 \mathrm{~g} / \mathrm{mL}\).

Calculate the number of carbon atoms in \(1.00 \mathrm{~g}\) of table sugar, \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\).

Calculate the number of carbon atoms in \(1.00 \mathrm{~g}\) of blood sugar, \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\).

What is the mass of cuprite, \(\mathrm{Cu}_{2} \mathrm{O}\), that contains \(10.0 \mathrm{~g}\) of copper?

What is the mass of rust, \(\mathrm{Fe}_{2} \mathrm{O}_{3}\), that contains \(10.0 \mathrm{~g}\) of iron?

The volume occupied by each copper atom in a 1 -mole crystal is \(0.0118 \mathrm{nm}^{3}\). If the density of the copper crystal is \(8.92 \mathrm{~g} / \mathrm{cm}^{3},\) what is the experimental value of Avogadro's number?

Each atom in a crystal of aluminum metal occupies a theoretical cube that is \(0.255 \mathrm{nm}\) on a side. If the density of the aluminum crystal is \(2.70 \mathrm{~g} / \mathrm{cm}^{3},\) what is the experimental value of Avogadro's number?

How many electrons are in a Faraday?