Question

Draw a phase diagram(and label all parts completely) that is consistent with the following information: 1. Pressure is in mm Hg 2. Temperature is in °C 3. Liquid phase is denser than the solid phase 4. Has one triple point, which is located at 400 mm Hg and 70°C 5. Point A is located at 760 mm Hg and 35°C and is found on the equilibrium line between solid and liquid phases 6. Point B is located at 760 mm Hg and 150°C and is found on the equilibrium line between liquid and gas phases 7. Point Cis located at 700 mm Hg and 10°C 8. Point D is located at 800 mm Hg and 5°C 9. Point E is located at 350 mm Hg and 25°C 10. Point F is located at 780 mm Hg and 175°C 11. Answer the following questions about the phase diagram that you have drawn: Label all parts • What is point A called: o What is point B called: . What is point F called: From point C, if you keep the temperature constant, but you move from 700 to 300 mm Hg, you will be in what phase From point C, if you keep the pressure constant, but you move from 10°C to 80°C you will be in what phase From point E, if you keep the pressure constant, but move from 100°C to 25°C, this process is called

Answer 1

900 800 D OF OA Liquid B 700 C 600 Pressure (mmHg) 500 Solid Vapour 400 Triple point o E 300 200 100 0 0 50 100 150 200 250 300 Temperature (C)

If the liquid phase is more dense than the solid phase, the line that separates solid and liquids bends left.

The point A can be called the melting point or solidification point as here the solid gets converted into liquid or liquid gets converted to solid respectively.

The point B can be called the boiling point or dew point as here the liquid gets converted into vapour or vapour gets converted to liquid respectively.

The critical properties of the element is not given so we cannot name the point F accurately.

900 800 A 5 Liquid B 700 C C" 600 Pressure (mmHg) 500 Vapour Solid 400 Triple point E E 300 C' 200 100 0 0 50 100 150 200 250 300 Temperature (C)

From point C, if you keep the temperature constant, but you move from 700 to 300 mmHg, you will be in Solid phase itself.

From point C, if you keep the pressure constant, but you move from 10 to 80⁰C, you will be in liquid phase.

From point E, if you keep the pressure constant, but you move from 100 to 25⁰C, The process is called ​​​​​​​deposition.​​​​​​​