The essential oil found in cloves, eugenol (shown below), can be isolated by ste

Question

The essential oil found in cloves, eugenol (shown below), can be isolated by steam distillation because it is insoluble in water and has a measurable vapor pressure at 100 degree C even though it has a much higher boiling point than water. Use data from the table to calculate the mass percent of eugenol in the distillate. mass percent of eugenol will be present in the distillate? Number 90 % Incorrect. The mass percent is the mass of eugenol divided by the combined masses of all components, expressed as a percentage. The number entered was calculated using molar masses instead of masses. The mass of any component can be found by multiplying its mole fraction by its molar mass.

Explanation / Answer

partial vap pressure of Eugenol = 4 mm Hg/ 4mm Hg + 760 mm Hg = 0.0053 mm Hg

partial vapour pressure of water = 1-0.0053=0.9947 mm Hg

mass of water = 0.9947 * 18 = 17.9046

mass of eugenol = 0.0053 * 164 = 0.8692

mass percent of eugenol = [0.8692/ (0.8692 + 17.9046)] * 100 = 4.62%

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