(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

(a) Menthol is a crystalline substance with peppermint taste. A.6.2% s

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» Solution :(a)` Delta T_(f) = K _(f) m= (W _(B))/(M _(B))xx (1000)/(W _(A))` `8.45 =20.3 K kg mol ^(-1) xx (6.2 g )/( M _(B)) xx (1000)/(93.8kg` ` M _(B)=158 mol ^(-1)` (b) Henry.s Law: The SOLUBILITY of gas in a LIQUID is directly proporational to the pressure of the gas. Applications: 1. Solubility of `CO_(2)` is increased at high pressurre. 2. Mixture of He and `O_(2)` are used by deep sea divers because he is less soluble than nitrogen. (c ) `0.1M NaCl,` because it dissociates in solution and furnishes GREATER number of particles PER unit volume while glucose being a non-electrolyte does not dissociate.