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Mol air = 54/18 = 3
Fraksi mol etanol Xt = mol etanol / [mol etanol + mol air]
Xt = 0,6 / [0,6 + 3]
∴ Xt = 6/36 = 1/6
∴ fraksi mol air Xp = 1 - Xt = 1 - 1/6 = 5/6