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).
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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.
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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
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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!