A new substance developed in a laboratory has the following properties: normal melting point, 83.7°C; normal boiling point, 177°C; triple point, 200 torr and 38.6°C.

a. sketch the approximate phase diagram and label the solid, liquid and gaseous phases and the solid-liquid, liquid-gas and solid-gas phase boundaries.
b. sketch an approximate heating curve for a sample at constant temp, beginning at 500 tor and 25°C and ending at 200°C
c. what is the vapor pressure of the solid at 83.7°C?
d. which is the denser phase, solid or liquid? explain