1. Tardigrade
  2. Question
  3. Chemistry
  4. An organic liquid, A, is immiscible with water. When boiled together with water, the boiling point is 90° C at which the partial vapour pressure of water is 526 mm Hg. The atmospheric pressure is 736 mm H g. The weight ratio of the liquid and water collected is 2.5: 1. What is the molecular weight of the liquid?

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Q. An organic liquid, $A$, is immiscible with water. When boiled together with water, the boiling point is $90^{\circ} C$ at which the partial vapour pressure of water is $526\, mm\, Hg$. The atmospheric pressure is $736\, mm\, H g$. The weight ratio of the liquid and water collected is $2.5: 1$. What is the molecular weight of the liquid?

Solutions

Solution:

$\frac{ P _{ L }}{ P _{ H _{2} O }}=\frac{ n _{ L }}{ n _{ H _{2} O }}$
$\frac{736-526}{526}=\frac{ W _{ L } / M _{ L }}{ W _{ H _{2} O } / 18}$
$\frac{210}{526}=\frac{2.5}{ M _{ L }} \times 18$
$M _{ L }=112.7\, gm$