Answer:
The phase of water at 0.5 atm and 100°C is a liquid. At this specific pressure and temperature, water exists in its liquid state.
Water can exist in three different phases: solid (ice), liquid (water), and gas (water vapor). The phase that water is in depends on the temperature and pressure conditions it is subjected to. The phase diagram of water illustrates the relationship between temperature, pressure, and the phase of water.
At atmospheric pressure (1 atm), water boils at 100°C, transitioning from a liquid to a gas phase. However, when the pressure is reduced to 0.5 atm, the boiling point of water decreases. This means that at 0.5 atm, water can exist as a liquid at temperatures above its normal boiling point.
To determine the phase of water at 0.5 atm and 100°C, we need to refer to the phase diagram of water. The phase diagram shows that at 0.5 atm and 100°C, water is in its liquid phase.
Step-by-step explanation: