A substance is at a temperature of $$ 50^\circ\text{C} $$ an...

Question Analysis
This question assesses the student's ability to interpret phase diagrams and determine the phase change based on given conditions.

Key Concept Explanation
The boiling point is the temperature at which a liquid changes to a gas at a given pressure. If the temperature is increased above the boiling point, the substance will change from a liquid to a gas.

Step-by-step Solution
1. Identify the initial conditions: temperature = , pressure = 2 atm.
2. Determine the boiling point at 2 atm: .
3. Note that the substance is initially in the liquid phase (since

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