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Raoult's Law

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Raoult's law is given by:

i: pressure of component i
i: mole fraction in the solution
: vapor pressure of the pure substance i

In a solution with two liquids A and B, if no gas are present, the total vapor pressure is given by:

tot = PA + PB

A: vapor pressure of liquid A
B: vapor pressure of liquid B

For an ideal solution of liquids A and B, which obeys Raoult's law over the full range of composition. The total pressure is given by:

Which is equal to:
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