

Stoichiometry - Engineering
Q1: The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg. ?A 0.2
B 0.1
C 0.4
D 0.6
ANS:D - 0.6 To solve this problem, we can use Raoult's Law, which states that the vapor pressure of a solution is directly proportional to the mole fraction of the solvent in the solution. Mathematically, it can be represented as: 𝑃solution=𝑥solvent⋅𝑃solvent∗Psolution=xsolvent⋅Psolvent∗ Where:
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