Org. Chem.

A natural product (MW=150) distills with steam at a boiling temperature of 99 degrees Celsius at atmospheric pressure. The vapor pressure of water at 99 degrees Celsius is 733 mm Hg.

A) Calculate the weight of the natural product that codistills with each gram of water at 99 degrees Celsius.

B) How much water must be removed by steam distillation to recover this natural product from 0.5 g of a spice that contains 10% of the desired substance?

Org. Chem. Please Help - DrBob222, Monday, November 9, 2009 at 11:43pm
I'll get you started.
P(H2O)/P(org) = n(H2O)/n(org). Let's simplify some by calling H2O=w and organic = o
Pw/Po = nw/no
The total pressure is 1 atm or 760 mm Hg.
Since the partial pressure of water at this temperature from the problem is 733 mm, then the partial pressure of the organic material must be 760-733 = 27 mm.
We also know that n = grams/molar mass.
Substituting we get
733/27 = (grams w/18)/(grams o/150).
The problem wants to know grams o for 1 g water so substitute 1 for grams w.
733/27 = (1/18)/grams o/150).
Solve for grams o and you will have the answer to part (A).

Org. Chem. Please Help - CMM, Tuesday, November 10, 2009 at 12:09am
I solved for o and got 0.306957708 grams. Correct?

For B, I did this: 0.5 X 0.10 = 0.05 g

0.306957708 - 0.05 = 0.256957708 g of water, which is my answer. Correct?

  1. 👍 0
  2. 👎 0
  3. 👁 843
  1. I have 0.3 or A also.
    For B, however, I didn't do that.
    Frankly, I'm not sure what the problem is asking when it says, "How much water must be removed......? I interpret that to mean how much water must be steam distilled to obtain the 0.05 g.
    So I used the same equation I showed you in part A, solve for gH2O and plugged in 0.05/150 for grams organic/molar mass.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    A 100g sample of water at 90 degrees celsius is added to a 100g sample of water at 10 degrees celsius. The final temperature of the water is which of the following: a) between 50 degrees celsius and 90 degrees celsius b) 50

  2. chem

    A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J

  3. AP Chemistry

    Two solid objects, A and B, are placed in boiling water and allowed to come to temperature there. Each is then lifted out and placed in separate beakers containing 1000 g water at 10.0 degrees Celsius. Object A increases the water

  4. Chemistry

    How much time is required for a sound to travel 1 mile if the air temperature is: 0.0 Degrees Celsius 20.0 Degrees Celsius 40.0 Degrees Celsius 80.0 Degrees Celsius

  1. Chemistry

    What will be the final temperature of the water in an insulated container as the result of passing 6.00g of steam at 100.0 degrees Celsius into 100.0g of water at 24.0 degrees Celsius?

  2. Physics

    How much energy is needed to melt 0.225 kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celsius and is poured in the mold immediately after it has melted.

  3. Chemistry URGENT

    can someone please tell me what formula's to use for the 2 following chemistry problems. 1. Calculate the solubility of potassium bromide at 23 degrees Celsius. hint. Assume that the solubility increases by an equal amount for

  4. chemistry

    How much heat is necessary to change a 52.0 g sample of water at 33 degrees celsius into steam at 110 degrees celsius?

  1. Physics

    How much thermal energy is released when 500 g of steam at 100 degrees celsius condenses into liquid and then cools to 50 degrees celsius. What I`ve Attempted: Q=mLv m = 500g (0.5 kg) Lv = 2.3*10^6 Q=(0.5)(2.3*10^6) Q=1,150,000 J

  2. College Algerbra

    THE TEMPERATURE ON A SUMMER DAY IS // DEGREES FAHRENHEIT.the formula to convert the temperature to degrees Celsius is C = 5/9(F-32) what is the corresponding temperature in degrees Celsius?

  3. chemistry

    Calculate the enthalpy change for converting 10.0g of ice at -25 degrees Celsius to water at 80 degrees Celsius. The specific heats of ice, water, and steam are 2.09j/g degrees Celsius, 4.18j/g degrees Celsius, and 1.85j/g degrees

  4. Physics

    How many calories are needed to change 1 gram of 100 degrees Celsius boiling water to 100 degrees Celsius steam?

You can view more similar questions or ask a new question.