(Solved): P2 :Phase diagram for sulphur dioxide The phase diagram of sulphur dioxide is shown in Fig. 1. 1. W ...

P2 :Phase diagram for sulphur dioxide The phase diagram of sulphur dioxide is shown in Fig. 1. 1. What is the stable phase of sulphur dioxide at usual temperatures $(0^{?}\mathrm{C}<$ $T<30^{?}\mathrm{C})$ and atmospheric pressure $(P=1\mathrm{atm})?$ 2. Estimate the triple point of sulphur dioxide. 3. At $P=4$ bars, below what temperature does sulphur dioxide solidify? 4. The critical point, $\left(T_c,P_c\right)$ is not shown on this phase diagram. Nevertheless, can you deduce lower (or upper) limits on $T_c$ and $P_c$ ? Figure 1 - The phase diagram of sulphur dioxide. The vertical axis is Pressure (in bars) on a logarithmic scale while the horizontal axis is Temperature (in Kelvins) on a linear scale. while the partial pressure pressure of dry air evolves with temperature as $P_{\mathrm{da}}(T)=P_{\mathrm{da}}\left(T_I\right)\left(\frac{T}{T_I}\right)$ where $T_I=20^{?}\mathrm{C}$ and $L=40.8{\mathrm{kJmol}}^{?1}$ is the latent heat of vaporization of water. 3. Use Maple to plot $P_C?P_S(T)$ and $P_{\mathrm{da}}(T)$. Use your graph to find the internal temperature at which the valve opens. 4. Assuming that the air is completely expelled when the valve first opens, find the new critical temperature at which the valve will open again.