What phase of CO2 exists at 1.25 atm pressure and a temperature of (a)-90^∘ C ; (b) -60^∘ C; (c)

step 1 This question is asking for CO2 phases at different temperatures. So we've been given the pressu

What phase of CO2 exists at 1.25 atm pressure and a...

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Key Concepts

Pressure-Temperature Relationship

The pressure-temperature relationship describes how changes in pressure and temperature affect the state of a substance. This interdependence is fundamental in thermodynamics for predicting phase transitions; for instance, a substance may bypass the liquid state at low pressures, moving directly between solid and gas phases.

Sublimation

Sublimation is the direct transition of a substance from the solid phase to the gas phase without becoming liquid first. This process typically occurs when the ambient pressure is too low to support the liquid phase, making it a key concept in understanding phase behavior under reduced pressure conditions.

Phase Diagram

A phase diagram is a graphical tool that represents the states of matter (solid, liquid, and gas) of a substance under different temperature and pressure conditions. It is essential for understanding which phase a material will be in under specified conditions and shows the boundaries where phase transitions occur.

Triple Point

The triple point is the unique set of conditions (specific temperature and pressure) at which a substance can coexist in equilibrium in all three phases: solid, liquid, and gas. This concept is crucial because it defines the lower pressure limit at which the liquid phase may exist.

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