sebanyak 30 gram utrea dilarutkan ldlam 81 gram air.menghassilkan fraksi mol sebesar .mr urea 60

diketahui :
wt = 30 gram (Mr = 60)
wp = 81 (Mr = 18)

ditanya :
Xt = .............................?
Xp = ............................?

penyelesaian :
nt = wt/Mr = 30/60 = 0,5 mol
np = wp/Mr = 81/18 = 4,5 mol

Xt = nt(nt+np) = 0,5/(0,5+4,5) = 0,5/5 = 0,1
Xp = 1 - Xt = 0,9