Argon gas has its triple point at –189.3°C and 516 mm Hg. It has a critical point at –122°C and 48 atm. The density of the solid is 1.65 g/cm3, whereas that of the liquid is 1.40 g/cm3. Sketch the phase diagram for argon and use it to fill in the blanks below with the words “boils,” “melts,” “sublimes,” or “condenses.”
(a) Solid argon at 500 mm Hg ________ when the temperature is increased.
(b) Solid argon at 2 atm ________ when the temperature is increased.
(c) Argon gas at –150°C ________ when the pressure is increased.
(d) Argon gas at –165°C ________ when the pressure is increased.
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