tentukan fraksi mol alkohol (C2H2OH) dalam larutan alkohol 75%

wt = 75 gram (Mr = 40)
wp = 100 - 75 = 25 (Mr = 18)
Xt = .........................................?

nt = wt/Mr = 75/40 = 1,875 mol
np = wp/Mr = 25/18 = 1,389 mol

Xt = nt/(nt+np) = 1,875/(1,875+1,389) = 1,875/3,264 = 0,574