If two liquids \(A\) and \(B\) have
\[
P_A^\circ:P_B^\circ=1:2
\]
and have mole fraction in solution as \(1:2\), then mole fraction of \(B\) in vapour phase is
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For ideal solutions,
\[
\boxed{
P_i=x_iP_i^\circ
}
\]
and
\[
\boxed{
y_i=\frac{P_i}{P_{\text{total}}}.
}
\]