hitung fraksi mol dari larutan urea 30% Mr urea=60 Mr air = 18!

Kita menganggap kalau 100% = 100 gr

Massa urea = 30% = 30 gr (Mr=60)
Massa air = 100%-30% = 70% = 70 gr (Mr=18)
x ...?

nt = gr/Mr = 30/60 = 0,5
np = gr/Mr = 70/18 = 3,88

xUrea = nt/np+nt
xUrea = 0,5/0,5+3,88
xUrea = 0,5/4,388
xUrea = 0,114