Compounds A and B form an ideal solution. The vapor pressure of pure A is P= 72.2 mmHg and a solution with a mole fraction of A of XA= 0.60 has a total vapor pressure of PTot= 59.6 mmHg. What is the vapor pressure of pure B?

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8. Compounds A and B form an ideal solution. The vapor pressure of pure A is P= 72.2 mmHg and a solution with a mole fraction of A of XA= 0.60 has a total vapor pressure of PTot= 59.6 mmHg. What is the vapor pressure of pure B?

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Total vapor pressure of the solution, PT = 59.6 mm Hg

Vapor pressure of pure A, P˚A =72.2 mm Hg

Vapor pressure of pure A, P˚B = unknown

Mol fraction of A, xA = 0.60

Mol fraction of B, xB = 1- xA

                                    =1-0.60

                                    = 0.40

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