To sketch the phase diagram of oxygen, O₂, we need to plot temperature on the y-axis and pressure on the x-axis. We can use the given information to plot the various regions on the phase diagram.
First, we plot the triple point at -219°C and 1.10 mmHg as a point on the diagram. This point represents the temperature and pressure at which all three phases of oxygen (solid, liquid, and gas) coexist in equilibrium.
Next, we draw the solid phase region of oxygen below the triple point. The solid phase exists at pressures and temperatures below the triple point. We can label this region as "solid" or "Oxygen (s)".
Above the triple point, we can draw the liquid and gas phase regions. The liquid phase exists at temperatures and pressures between the triple point and the critical point, while the gas phase exists at temperatures and pressures above the critical point. We can label these regions as "liquid" or "Oxygen (l)" and "gas" or "Oxygen (g)" respectively.
The critical point, which is the highest temperature and pressure at which a gas can be liquefied by pressure alone, is located at -118°C and 50.1 atm. We can mark this point on the phase diagram and label it as "critical point".
Finally, we can draw a dashed line to represent the vaporization or melting curve of oxygen, which separates the solid and liquid phase regions. The point where this curve intersects the critical point represents the critical temperature and pressure.