The sample would contain the most liquid at the time when the temperature is at its lowest point, which is approximately at 250 degrees Celsius.
The sample contains the most liquid at the time when the temperature is at the maximum of the liquid-solid transition region on the cooling curve. This is because the temperature remains constant during a phase change, and the temperature at the maximum of the liquid-solid transition region is the highest temperature at which the sample can exist in the liquid phase. When the temperature is above this maximum, the sample will exist as a gas, and when the temperature is below this maximum, the sample will exist as a solid.
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