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air = 100-15 = 85 gram
fraksi mol = nt / nt+np
nt= mol terlarut (urea)
np = mol pelarut (air)
nt = 15/60 = 0,25
np = 85 / 18 = 4,72
fraksi mol = 0,25 / 0,25+ 4,72 = 0,05
pelarut 85%
nt =15/60 = 0.25 mol
np = 85/18 = 4. 72
Xt = nt/ nt + np
= 0.25/ 0.25 + 4.72 = 0.05