A certain substance has the phase diagram shown below. At which of the following values of T and P is the substance a pure liquid?

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a
T = 8°C, P = 1 atm
b
T = 80°C, P = 1 atm
c
T = 70°C, P = 1.2 atm
d
T = 10°C, P = 1 atm

1 answer

To determine where the substance is a pure liquid from the provided options, we would need to analyze the phase diagram. Since I cannot view the image you mentioned, I can guide you on how to interpret a phase diagram.

In a typical phase diagram, you will find the regions representing solid, liquid, gas, and the lines that represent phase boundaries (the lines or curves separating the phases).

  1. Identify the Liquid Region: Look for the region where the liquid phase is predominant. This includes areas that are strictly within the liquid region, not touching the solid or gas regions.

  2. Examine the Given Conditions: For each option, check if the temperature (T) and pressure (P) corresponds to the liquid phase on the diagram:

    • T = 8°C, P = 1 atm
    • T = 80°C, P = 1 atm
    • T = 70°C, P = 1.2 atm
    • T = 10°C, P = 1 atm
  3. Pure Liquid Point: In a phase diagram, a pure liquid condition generally occurs when you are clearly in the liquid region and not along the boundary lines (which would indicate a mixture with solid or gas).

To summarize, check the phase diagram at the specified T and P values, and identify which point is clearly located within the liquid region. This point will indicate where the substance is a pure liquid.

If you can provide a description of where these points fall on the phase diagram or specific characteristics of the diagram, I'd be happy to help you identify the correct condition!