Use the phase diagram to answer the following question:

Which state of matter is the most stable for water at 75oC under 2kPa of pressure?

Question

Use the phase diagram to answer the following question:

Which state of matter is the most stable for water at 75oC under 2kPa of pressure?

BlackTom AI · Accepted Answer

To determine the most stable phase of water at 75°C and 2 kPa, we reference the general phase behavior of water on a phase diagram.
First, consider how pressure affects the liquid phase: at low pressures, the boiling point of water drops. The boiling point of water at 2 kPa is well below 75°C, meaning that if water is at 75°C under this low pressure, it would have already begun to boil and would not remain in the liquid phase.
Next, compare the possible solid and gas phases at these conditions. The solid (ice) region for water exists at much lower temperatures for a given pressure, and at 2 kPa and 75°C, ice would not be stable because 75°C is far above the melting point under any typical low-pressure conditions.
Therefore the remaining stable phase under these conditions is the gaseous phase. In other words, at 75°C and 2 kPa, water cannot exist as a liquid or solid; it will be in the vapor state.
If the diagram showed pressure–temperature boundaries, you would see the liquid–gas boundary (boiling line) at 2 kPa occurring at a much lower temperature than 75°C, reinforcing that gas is the stable phase here.
Meanwhile, the solid–gas boundary (sublimation line) would be at temperatures far lower than 75°C for this pressure, so ice is not favored either. Consequently, the only phase compatible with 75°C and 2 kPa is water vapor.

Pre-AP CHEM S1 Final - P2

Use the phase diagram to answer the following question: Which state of matter is the most stable for water at 75oC under 2kPa of pressure?

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