A mixture of gases contains $0.31 \mathrm{~mol} \mathrm{CH}_4, 0.25 \mathrm{~mol}$ $\mathrm{C}_2 \mathrm{H}_6$, and $0.29 \mathrm{~mol} \mathrm{C}_3 \mathrm{H}_8$. The total pressure is $1.50$ bar. Calculate the partial pressures of the gases.

What is the mass of the solid $\mathrm{NH}_4 \mathrm{Cl}$ formed when $73.0 \mathrm{~g}$ of $\mathrm{NH}_3$ are mixed with an equal mass of $\mathrm{HCl}$ ? What is the volume of the gas remaining, measured at $14.0^{\circ} \mathrm{C}$ and 752 torrs? What gas is it?

A compound of $\mathrm{P}$ and $\mathrm{F}$ was analyzed as follows: Heating $0.2324 \mathrm{~g}$ of the compound in a $378-\mathrm{cm}^3$ container turned it to all gas, which had a pressure of $97.3$ torr at $77^{\circ} \mathrm{C}$. Then the gas was mixed with a calcium chloride solution, which turned all of the $\mathrm{F}$ to $0.2631 \mathrm{~g}$ of $\mathrm{CaF}_2$. Determine the molecular formula of the compound.

In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide:

$$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(\mathrm{~s}) \longrightarrow 2 \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}(l)+2 \mathrm{CO}_2(\mathrm{~g})$$

If $5.97 \mathrm{~g}$ of glucose are reacted and $1.44 \mathrm{~L}$ of $\mathrm{CO}_2$ gas are collected at $293 \mathrm{~K}$ and $0.984$ bar, what is the percent yield of the reaction?

Freeze-dried coffee is prepared by freezing brewed coffee and then removing the ice component with a vacuum pump. Describe the phase changes taking place during these processes.

When coal is burned, the sulfur present in coal is converted to sulfur dioxide $\left(\mathrm{SO}_2\right)$, which is responsible for the acid rain phenomenon.

$$\mathrm{S}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \longrightarrow \mathrm{SO}_2(\mathrm{~g})$$

If $2.54 \mathrm{~kg}$ of $\mathrm{S}$ are reacted with oxygen, calculate the volume of $\mathrm{SO}_2$ gas (in $\mathrm{mL}$ ) formed at $30.5^{\circ} \mathrm{C}$ and $1.12$ bar.