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When all the liquid has evaporated the vapor totally fills the florence flask and exerts a pressure equal to the atmospheric pressure why?
Wiki User
∙ 13y ago
I'm guessing you are analyzing an experiment where you are determining the molecular mass of an organic liquid. You heated the flask and the liquid evaporated filling the flask, but escaping through a small hole in the covering.
1. Gases always fill the container. So, if the liquid evaporated and formed a gas (vapor), it filled the flask,
2. The pressure on the outside the flask is air pressure. since the vapor isn't pushing off the cover, the pressure is not higher than the air pressure. But since the extra escaped, it cannot be less than the air pressure. Therefore, it is the same.
Wiki User
∙ 13y ago
When all the liquid has evaporated in the Florence flask, the gaseous molecules from the liquid fill the entire volume of the flask, creating pressure due to their collisions with the walls of the flask. Since the gaseous molecules are now evenly distributed throughout the flask, they collectively exert a pressure equal to the atmospheric pressure.
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