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maka metanol 80 gram
air = 20 gram
mol metanol (CH3OH) = 80/32=2,5
mol air (H2O) = 20/18 = 1,11
maka fraksi mol etanol adalah mol etanol/(mol etanol + mol air)
= 2,5/(1,11+2,5)
=2,5/3,61
= 0,69