Question:
How this came "p1 =y1.ptotal ".
Answer:
According to Dalton’s law of partial pressure addition of volatile solute to a solvent increases the total vapor pressure. Due to the presence of vapor of the solvent and the solute above the solution.
y = fraction of component in the form of vapor above the solution.
As per Dalton’s law of partial pressure fraction of any component in the form of vapor = y1 = p1/p total
Or p1 = y1 X p total
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