Question

Eugenol is a non electrolyte that contributes to the flavor of spices such as clove, nutmeg, cinnamon, and basil. A 328 mg sample was dissolved in 10.0 g of chloroform (Kb=3.63°C/m), increasing the boiling point of the chloroform by 0.726°C. What is the molar mass of eugenol?

Answer 1

To determine the molar mass of eugenol, we use the boiling point elevation method. By knowing the boiling point elevation, the mass of eugenol, the mass of the solvent, and the ebullioscopic constant for chloroform, we can calculate the molar mass of eugenol.

Step-by-step explanation:

The student is asking about finding the molar mass of eugenol based on the boiling point elevation of chloroform after dissolving eugenol in it. To find the molar mass of eugenol, we use the formula ∆T = i * Kb * m, where ∆T is the boiling point elevation, Kb is the ebullioscopic constant for chloroform, and m is the molality of the solution.

The boiling point elevation is given as 0.726°C, and Kb for chloroform is 3.63°C/m. Convert the mass of eugenol (328 mg = 0.328 g) and the mass of chloroform (10.0 g) to kilograms and calculate the molality. The molality, m, is then used to find the molar mass of eugenol by rearranging the equation to solve for molar mass (∆T / (Kb * m)). With a single solute particle (i=1 for eugenol, since it's a non-electrolyte), we can find the molar mass directly from the calculated molality.