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1‑Propanol (𝑃∘1=20.9 Torr at 25 ∘C) and 2‑propanol (𝑃∘2=45.2 Torr at 25 ∘C) form ideal solutions in all proportions. Let 𝑥1 and 𝑥2 represent the mole fractions of 1‑propanol and 2‑propanol in a liquid mixture, respectively, and 𝑦1 and 𝑦2 represent the mole fractions of each in the vapor phase. For a solution of these liquids with 𝑥1=0.420, calculate the composition of the vapor phase at 25 ∘C.