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Understanding Phase Changes

Attached is a graph and using this graph, I need to figure out what phase changes are occurring when the temperature is held constant at 150 EC and the pressure is increased from 0.25 atm to 1.4 atm?
- Gas-liquid-solid?
- Gas-solid-liquid?
- Liquid-solid-gas?
- Solid-liquid vapor?

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Please refer to the attached file.


First, I'd like you to understand how to read a phase diagram. When you go from left to right of the white line I drew, you're increasing the temperature. As ...

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