Multiple Choice
At a temperature of 150 °C and standard atmospheric pressure, what is the phase of water?
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2. Atoms & Elements
Periodic Table: Phases
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At 100 °C and 1 atm, water is in which phase?
A
Gas
B
Both liquid and gas (at equilibrium)
C
Liquid
D
Solid
Verified step by step guidance1
Identify the boiling point of water at 1 atm pressure, which is 100 °C. This is the temperature at which water transitions between liquid and gas phases.
Understand that at the boiling point and at 1 atm, water exists in a dynamic equilibrium where both liquid and gas phases coexist.
Recall that equilibrium means the rate of evaporation equals the rate of condensation, so both phases are present simultaneously.
Recognize that below 100 °C at 1 atm, water is typically liquid, and above 100 °C it is typically gas, but exactly at 100 °C and 1 atm, both phases coexist.
Conclude that at 100 °C and 1 atm, water is in both liquid and gas phases at equilibrium.
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