The vapour pressures of two pure liquids \( A \) and \( B \) that form an ideal solution are 300...

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The vapour pressures of two pure liquids \( A \) and \( B \) that form an ideal solution are 300 and 800 torr, respectively, at temperature \( T \). A mixture of the vapours of \( A \) and \( B \) for which the mole fraction of \( A \) is 0.25 is slowly compressed at temperature \( T \). Calculate
a. The composition of the first drop of the condensate.
b. The total pressure when this drop is formed.
c. The composition of the solution whose normal boiling point is \( T \).
d. The pressure when only the last bubble of vapour remains:
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