4. When Iodobenzene (b.p. 188.5 0C) codistils with water at 760 torr, the boilin

Question

4. When Iodobenzene (b.p. 188.5 0C) codistils with water at 760 torr, the boiling point of the mixture is 98.5 0C. Calculate the weight of water needed to codistill 1.0 g idobenzene using steam distillation. The vapor pressure of water at 98.5 0C is 714 torr.
5. Why did you extract Eugenol with methylene chloride, but not with toluene? Explain.
4. When Iodobenzene (b.p. 188.5 0C) codistils with water at 760 torr, the boiling point of the mixture is 98.5 0C. Calculate the weight of water needed to codistill 1.0 g idobenzene using steam distillation. The vapor pressure of water at 98.5 0C is 714 torr.
5. Why did you extract Eugenol with methylene chloride, but not with toluene? Explain.
4. When Iodobenzene (b.p. 188.5 0C) codistils with water at 760 torr, the boiling point of the mixture is 98.5 0C. Calculate the weight of water needed to codistill 1.0 g idobenzene using steam distillation. The vapor pressure of water at 98.5 0C is 714 torr.
5. Why did you extract Eugenol with methylene chloride, but not with toluene? Explain.

Explanation / Answer

4)

Partial pressure of Iodobenzene (Pa) = 760 - 714

= 46 torr

Partial pressure of water (Pb) = 714 torr

Pa/Pb = moles of a /moles of b

46/714 = moles of a/ 1/18

46/714 = moles of a/ 0.055

moles of a = 0.0035 moles

grams of iodobenzene/204.01 = 0.0035

grams of benzene = 0.0035 x 204.01

=0.714 g

for 1 gram of water = 0.714 g of iodo benzene

for 1 g of iodobenzene = 1.4 g of water

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