Chemistry

Question Analysis
This question assesses the ability to determine the phase of a substance based on its melting point and given temperature and pressure conditions.

Key Concept Explanation
The melting point is the temperature at which a solid changes to a liquid at a given pressure. Below the melting point, the substance remains in the solid phase.

Step-by-step Solution
1. Identify the given conditions: Temperature = 45°C, Pressure = 1 atm.
2. Compare the given temperature to the melting point: 45°C < 50°C.
3. Since the temperature is below the melting point, the substance is in the s...