Which law specifically governs the relative lowering of vapor pressures in solutions?(a) van’t Hoff law(b) Boyle’s law(c) Raoult’s law(d) Amagat’s lawI had been asked this question during an online interview.I want to ask this question from Colligative Properties and Determination of Molar Mass in chapter Solutions of Chemistry – Class 12

Which law specifically governs the relative lowering of vapor pressure

1.	Which law specifically governs the relative lowering of vapor pressures in solutions?(a) van’t Hoff law(b) Boyle’s law(c) Raoult’s law(d) Amagat’s lawI had been asked this question during an online interview.I want to ask this question from Colligative Properties and Determination of Molar Mass in chapter Solutions of Chemistry – Class 12
Answer» The correct CHOICE is (c) Raoult’s law To explain I would say: Raoult’s law QUANTIFIES the relative lowering in vapor pressure. From the law, it follows that p1 = X1 x p^01. If p^01 was the original pressure before X2 mole fraction of SOLUTE was ADDED to the SOLVENT then reduction in vapor pressure is given as: Δp1 = p^01 – p1 = p^01– p^01 X1 = p^01(1 – X1) = p^01X2 Therefore, the relative reduction in vapor pressure (∆p1/p^01) = X2 i.e. mole fraction of solute in the solution.

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