When an unknown liquid is steam distilled at 93 degree C ( the vapor pressure of water at this temperature is?

Question

589mm) and 760mm, the distillate contains 6.0g of water and 11.0g of oil. Calculate the molecular weight of the oil.

Someone please help me with this problem. Thanks.

Oh, one more thing, what is the chemical equation of eugenol benzoate???

Please tell me if you know, no need for unnecessary answers.

Thanks again!!!

Answer 1

In steam distillation there is a vapor liquid equilibrium between a gas phase and liquid phase of two immiscible liquid. Hence the partial pressures in gas phase is equal to the pure component vapor pressures.

The molar fraction of water vapor in gas phase is the quotient of partial pressure and total pressure:
y₁ = 589mmHg / 760mmHg = 0.775
The rest is oil:
y₂ = 1 - y ₁ = 0.225

From the analysis of the destillate you get the mass fractions in vapor phase:
w₁ = 6g / (6g + 11g) = 0.353

The mass fraction and the molar fraction are related to each other by the molar masses M:
w₁ = m₁ / (m₁ + m₂)
= n₁·M₁ / (n₁·M₁ + n₂·M₂)
= y₁·M₁ / (y₁·M₁ + y₂·M₂)
= 1 / [1 + (y₂·M₂)/ (y₁·M₁]

Solve for the molar mass of the oil:
M₂ = (1/w₁ - 1) · (y₁/y₂) · M₁
= (1/0.353 - 1) · (0.775/0.225) · 18g/mol
= 113.67g/mol

Answer 2

water vapor can exist at exceedingly a lot any temperature and stress. At sea aspect, decrease than 0 levels C, that's continually replacing backward and forward between ice and water vapor, in spite of the undeniable fact that this happens more beneficial slowly the chillier it receives. that's the reason you ice cubes look to evaporate and also you get frost on the interior your freezer--the ice is evaporating and starting to be ice elsewhere without ever starting to be liquid (sublimation). in case you look at a triple-aspect diagram for water, that's going to look to allow you to know that water vapor in undemanding words exists in a small stress-temperature area. in spite of the undeniable fact that, the triple-aspect diagram in undemanding words tells you the position LIQUID and robust states are plausible--water vapor easily exists by the finished diagram.