1.

(a) Menthol is a crystalline substance with peppermint taste. A.6.2% solution of menthol in cyclohexane freezes at -1.95^(@)C. Determine the formula mass of menthol. The freezing point and molar depression constant of cyclohexane are 6.5 ^(@)C and 20.2Km ^(-1), respectively. (b) State Henry's Law and mention its two important applications. (c ) Which of the following has higher boiling point and why ? 0.1M NaCl or 0.1 M Glucose

Answer» <html><body><p></p>Solution :(a)` Delta T_(f) = K _(f) m= (W _(B))/(M _(B))xx (1000)/(W _(A))` <br/> `8.45 =20.3 K kg mol ^(-<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>) xx (6.2 g )/( M _(B)) xx (1000)/(93.8kg` <br/> ` M _(B)=158 mol ^(-1)` <br/> (b) Henry.s Law: The <a href="https://interviewquestions.tuteehub.com/tag/solubility-1217018" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUBILITY">SOLUBILITY</a> of gas in a <a href="https://interviewquestions.tuteehub.com/tag/liquid-1075124" style="font-weight:bold;" target="_blank" title="Click to know more about LIQUID">LIQUID</a> is directly proporational to the pressure of the gas. <br/> Applications: <br/> 1. Solubility of `CO_(2)` is increased at high pressurre. <br/> 2. Mixture of He and `O_(2)` are used by deep sea divers because he is less soluble than nitrogen. <br/> (c ) `0.1M NaCl,` because it dissociates in solution and furnishes <a href="https://interviewquestions.tuteehub.com/tag/greater-476627" style="font-weight:bold;" target="_blank" title="Click to know more about GREATER">GREATER</a> number of particles <a href="https://interviewquestions.tuteehub.com/tag/per-590802" style="font-weight:bold;" target="_blank" title="Click to know more about PER">PER</a> unit volume while glucose being a non-electrolyte does not dissociate.</body></html>


Discussion

No Comment Found

Related InterviewSolutions