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Chemestry help!
Offline Heat

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#1
Chemestry help!

Help plz.

1. The vapor pressure of benzene is 100.0 mmHg at
26.1°C. Calculate the vapor pressure of a solution
containing 24.6 g of camphor (C10H16O) dissolved in
98.5 g of benzene. (Camphor is a low-volatility solid.)

2. The vapor pressures of ethanol (C2H5OH) and
1-propanol (C3H7OH) at 35°C are 100 mmHg and
37.6 mmHg, respectively. Assume ideal behavior
and calculate the partial pressures of ethanol and
1-propanol at 35°C over a solution of ethanol in
1-propanol, in which the mole fraction of ethanol
is 0.300.

3. The vapor pressure of ethanol (C2H5OH) at 20°C is
44 mmHg, and the vapor pressure of methanol
(CH3OH) at the same temperature is 94 mmHg. A
mixture of 30.0 g of methanol and 45.0 g of ethanol
is prepared (and can be assumed to behave as an
ideal solution). (a) Calculate the vapor pressure of
methanol and ethanol above this solution at 20°C.
(b) Calculate the mole fraction of methanol and ethanol
in the vapor above this solution at 20°C. © Suggest
a method for separating the two components of
the solution.

4. How many grams of urea [(NH2)2CO] must be added
to 450 g of water to give a solution with a vapor
pressure 2.50 mmHg less than that of pure water at
30°C? (The vapor pressure of water at 30°C is
31.8 mmHg.)
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01 May 2013, 01:50 PM
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Offline Heat

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#2
Re: Chemestry help!

Thnks Lich.

My brotha solved it for me.

So, can anyone lock this?.
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01 May 2013, 09:27 PM
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Offline Pulse

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#3
Re: Chemestry help!

Okey dokey, I was about to do it :P
01 May 2013, 09:31 PM
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