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Author Question: Which of the following compounds could be subjected to sublimation at atmospheric pres sure? (a) ... (Read 16 times)

kamilo84

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on: Aug 23, 2018

Which of the following compounds could be subjected to sublimation at atmospheric pres
  sure?
  (a) Compound A: vapor pressure at its melting point = 770 mm Hg
  (b) Compound B: vapor pressure at its melting point = 400 mm Hg
  (c) Compound C: vapor pressure at its melting point = 10 mm Hg



Question 2

Limonene (MW 136) is a pleasant-smelling liquid found in lemon and orange peels. The bp of
  limonene is 175, but it co-distills with water at 97.5. If the vapor pressure of water at 97.5 is
  690 mm Hg, what percentage of the steam-distillate is limonene?



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livaneabi

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Reply #1 on: Aug 23, 2018
Answer to Question 1

Compounds A and B will have significant vapor pressure at their melting point.

Answer to Question 2

wtwater/wtlimonene = (690 x 18)/(70 x 136) = 1.3
Thus, for each 1.3 g of water, 1 g of limonene distills. Therefore, 1/2.3 g = 43 of the steam-dis
tillate is limonene.



kamilo84

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Reply 2 on: Aug 23, 2018
Gracias!

brbarasa

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Reply 3 on: Yesterday
Wow, this really help

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