When measuring the mass of a condensed volatile liquid collected, you need to correct its mass by the mass of the air lost in the process, information we need to complete this correction is:
Barometric pressure during the vapor collection experiment. Vapor pressure of the condensed liquid at the conditions of the experiment Density of air at the temperature and pressure of the experiment Moles of air present before collecting the vapor Volume of the flask used to collect the vapor.
Barometric pressure is the measurement of air pressure in the atmosphere, specifically the measurement of the weight exerted by air molecules at a given point on Earth.
In an ideal case, the vapor pressure is hardly influenced by the atmospheric pressure because we ignore the intermolecular forces in ideal vapors.
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