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A liquid solution consists of 0.30 mole fraction ethylene dibromide, C2H4Br2, and 0.70 mole fraction propylene dibromide, C3H6Br2. Both ethylene dibromide and propylene dibromide are volatile liquids; their vapor pressures at 85°C are 173 mmHg and 127 mmHg, respectively. Assume that each compound follows Raoult’s law in the solution. Calculate the total vapor pressure of the solution.

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Robert Kubara
Robert KubaraLv10
28 Dec 2020

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Related questions


A pending refinery operation is being designed. A gas stream in this operation is to be partially condensed at 80. The composition of the gas is:

A: 5% (mole)

B: 30%

C: 55%

D: 10%

Determine the pressure for the partial condenser required to condense 75% of the gas stream. Assume Raoult’s law is valid. The Antoine equation and the appropriate coefficients are given below:

with in mmHg and T in .

ai

bi

ci

A

6.6783

1190.0342

245.8321

B

6.8991

1245.0565

233.0989

C

7.0124

1309.9879

220.8011

D

7.2001

1469.9987

212.8345

Use Excel to do the following:

Calculate the vapor pressures of the pure components.

Assume 100 moles of feed gas and calculate the moles of vapor and liquid that must come from the condenser.

Write material balances for each component around the condenser.

Use Raoult’s Law to relate y to x for each component in terms of its vapor pressure and the to-be-determined total pressure P.

Substitute the expressions you found for y into the material balances, which should each now have two unknowns --- x and P.

Solve for each x

Add the four expressions for the mole fractions x in the liquid.

Find P that makes the sum of the mole fractions in the liquid equal to 1.

Check your answer by confirming that sum of the mole fractions in the vapor also equal 1.

Specific answers please.

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