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mol air = 180/18 = 10
fraksi mol zat terlarut Xt = mol X / [mol X + mol air]
Xt = (10/Mr) /[(10/Mr) + 10]
penurunan tekanan uap larutan = po. Xt
0,3 = (25,2) . (10/Mr) /[(10/Mr) + 10]
3/Mr + 3 = 252/Mr
249/Mr = 3
jadi Mr zat = 249/3 = 83