Sketch a plausible phase diagram for hydrazine (N₂H₄) from the following data: triple point (2.0 °C and 3.4 mmHg), the normal melting point (2 °C) the normal boiling point (113.5 °C), and the critical point (380 °C and 145 atm). The density of the liquid is less than that of the solid. Label significant data points on this diagram. Are there any features of the diagram that remain uncertain? Explain.