16) The phase diagram for ammonia is shown below (not drawn to scale) 111.3 atm

Question

16) The phase diagram for ammonia is shown below (not drawn to scale) 111.3 atm atm 0.060 atm - 77.75 °C 25 °C 132.4 °C a) What state is ammonia in at 25°C and 1 atm? b) What state is ammonia in at -80°C and 10 atm? c) What are the temperature and pressure at the triple point of ammonia? d) What are the temperature and pressure at the critical point of ammonia? e) If you heat ammonia from -100°C to 150oC at a pressure of 5 atm, what states will you observe? f A container holds ammonia at a temperature of -77.70°C and a pressure of 0.010 atm. If the pressure is increased to 150 atm while the temperature is held constant, what states will you observe? g) If you increase the temperature of ammonia from 125°C to 175°C at a pressure of 200 atm, what states will you observe? h) What part of this phase diagram represents the vapor pressure curve for solid NH3?

Explanation / Answer

a. Gas

b. Solid

c. T = -77.75 deg C; P = 0.060 atm

d. T = 132.4 deg C; P = 111.3 atm

e. Gas

f. Solid

g. Gas

h. Lowest part

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