An ideal mixture of liquids A and B with 2 moles of A and 2 moles of B has a total vapour pressure of 1 atm at a certain temperature. Another mixture with 1 mole of A and 3 moles of B has a vapour pressure greater than 1 atm. But if 4 moles of C are added to the second mixture, the vapour pressure comes down to 1 atm. Vapour pressure of C, Pc° = 0.8 atm. Calculate the vapour pressures of pure A and pure B.
(1) PA° = 1.4 atm, PB° = 0.7 atm
(2) PA = 1.2 atm, PB° = 0.6 atm
(3) PA = 1.4 atm, PB° = 0.6 atm
(4) PA° = 0.6 atm, PB° = 1.4 atm
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