Problem 128
Nitrogen forms several gaseous oxides. One of them has a density of \(1.33 \mathrm{~g} / \mathrm{L}\) measured at \(764 \mathrm{mmHg}\) and \(150^{\circ} \mathrm{C}\). Write the formula of the compound.
Problem 129
Nitrogen dioxide \(\left(\mathrm{NO}_{2}\right)\) cannot be obtained in a pure form in the gas phase because it exists as a mixture of \(\mathrm{NO}_{2}\) and \(\mathrm{N}_{2} \mathrm{O}_{4}\). At \(25^{\circ} \mathrm{C}\) and \(0.98 \mathrm{~atm}\), the density of this gas mixture is \(2.7 \mathrm{~g} / \mathrm{L}\). What is the partial pressure of each gas?
Problem 130
Lithium hydride reacts with water as follows: $$ \mathrm{LiH}(s)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{LiOH}(a q)+\mathrm{H}_{2}(g) $$ During World War II, U.S. pilots carried LiH tablets. In the event of a crash landing at sea, the \(\mathrm{LiH}\) would react with the seawater and fill their life jackets and lifeboats with hydrogen gas. How many grams of \(\mathrm{LiH}\) are needed to fill a 4.1-L life jacket at 0.97 atm and \(12^{\circ} \mathrm{C}\) ?
Problem 131
Assuming ideal behavior, which of the following gases will have the greatest volume at STP? (a) 0.82 mole of \(\mathrm{He},\) (b) \(24 \mathrm{~g}\) of \(\mathrm{N}_{2},\) or (c) \(5.0 \times 10^{23}\) molecules of \(\mathrm{Cl}_{2}\).
Problem 132
Calculate the density of helium in a helium balloon at \(25.0^{\circ} \mathrm{C}\). (Assume that the pressure inside the balloon is \(1.10 \mathrm{~atm} .)\)
Problem 133
Helium atoms in a closed container at room temperature are constantly colliding with one another and with the walls of their container. Does this "perpetual motion" violate the law of conservation of energy? Explain.
Problem 134
Uranium hexafluoride \(\left(\mathrm{UF}_{6}\right)\) is a much heavier gas than hydrogen, yet at a given temperature, the average kinetic energies of these two gases are the same. Explain.
Problem 136
The plot of \(Z\) versus \(P\) for a gas at \(0^{\circ} \mathrm{C}\) is shown. Explain the causes of the negative deviation from ideal behavior at lower pressures and the positive deviation from ideal behavior at higher pressures.
Problem 137
In \(2.00 \mathrm{~min}, 29.7 \mathrm{~mL}\) of He effuses through a small hole. Under the same conditions of pressure and temperature, \(10.0 \mathrm{~mL}\) of a mixture of \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\) effuses through the hole in the same amount of time. Calculate the percent composition by volume of the mixture.
Problem 138
A mixture of methane \(\left(\mathrm{CH}_{4}\right)\) and ethane \(\left(\mathrm{C}_{2} \mathrm{H}_{6}\right)\) is stored in a container at \(294 \mathrm{mmHg}\). The gases are burned in air to form \(\mathrm{CO}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\). If the pressure of \(\mathrm{CO}_{2}\) is 356 \(\mathrm{mmHg}\), measured at the same temperature and volume as the original mixture, calculate the mole fractions of the gases.
