Nitrogen has a normal boiling pointof 77.3 Kanda melting point (at 1 atm) of 63.1 K. Its critical temperature is 126.2 K and its critical pressure is 2.55 x 10 torr. It has a triple point at 63.1 K and 94.0 torr. Sketch the phase diagram for nitrogen. Does nitrogen have a stable liquid state at 1 atm?

The planet Mars has an atmosphere of mostly COz (95%). (You can assume that Mars atmosphere is100% COz). The molecular weight of COz is 44. The temperature at "night" is cold at -140°C (i.e. minus 140° Celsius).. The temperature at "noon" during the day is +26°C. What is its velocity of sound "c"during the day and during the night (in m/s) on Mars?

Shown above is a phase diagram for Xe (not drawn to scale). Use this phase diagram to pick the correct statement from the following multiple choices. a) The point at T = 161.2 K and P = 1 atm is called the triple point. b) At T = 166.2 K and P = 1 atm Xe exists as part solid and part liquid only (no gas). c) The point at T = 166.2 K and P = 1 atm is called the normal boiling point. d) The point at T = 289.8 K and P = 57.6 atm is called the normal melting point. e) At T = 221.00 K and P = 0.1855 atm Xe exists as part liquid and part gas only (no solid).

Choose from the choices and show complete solution with clear explanation please, thank you.