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mol urea = massa/Mr
= 12/60
= 0,2 mol
mol air = massa/Mr
= 90/18
= 5 mol
* Mencari fraksi mol urea
X urea = mol urea/(mol urea + mol air)
= 0,2/(0,2 + 5)
= 0,2/5,2
= 0,0385
Jadi, fraksi mol urea adalah 0,0385