$3\mathrm{.}3$ Does $O_2$ or $H_{2}O$ have the higher pressure at the same values of $T$ and $\frac{?}{\text{b}\text{a}\text{r}}(V)?($Use Table $3\mathrm{.}1$ to predict, without calculation.$)$

$3\mathrm{.}4$ Describe a path between points A and $C$ in Fig. $3\mathrm{.}6$ along which liquid and gas can be distinguished.

$3\mathrm{.}5$ Give physical arguments explaining why the critical pressure and temperature should increase with increasing van der Waals a values.

Table $3\mathrm{.}1$

van der Waals constants

$\backslash$table$[[Gas,\frac{a}{P}a{m}^{6}mo{l}^{-2},\frac{b}{{10}^{-6}}{m}^{3}mo{l}^{-1}$