1. a system consists of liquid nitrogen in equilibrium with nitrogen vapor. How

Question

1. a system consists of liquid nitrogen in equilibrium with nitrogen vapor. How many phases are present? The system undergoes a process during which all of the liquid is vaporized. Can the system be viewed as a pure substance during the process? Explain.

2. An open container of pure ethanol (ethyl alcohol) liquid is placed on a table in a room. Evaporation occurs until all of the ethanol is gone. Where did the alcohol go? If the ethanol liquid and the room air are taken to be a closed system, can the system be regarded as a pure substance during the process? How many phases are present initially and finally? Explain

Explanation / Answer

1.there are 2 phases,

yess ,it is a pure substance,are there is no change in compositon

2.the alchohol is lost to the surroundings,the boiling point of etanol is close to the room temperature,hence it evaporates

when taken in closed system ,there are 3 phases,

ethanol (liquid) ,ethanol(vapour) ,water(liquid)

no,it is not pure,as the phases have different compositions

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