Fraksi mol dari larutan ure 40℅ berat dengan mr urea 60 dan mr air 18

wt = 40 gram (Mr = 60)
wp = 60 gram (Mr = 18)
Xt = .....?
Xp = .....?

nt = wt/Mr = 40/60 = 0,67
np = wp/Mr = 60/18 = 3,33

Xt = nt/(nt+np)
= 0,67/(0,67+3,33)
= 0,67/4
= 0,168

Xp = 1 - Xt
= 1 - 0,168
= 0,832