Jawabanmu

2014-09-09T13:52:01+07:00
Dalam 10% larutan urea terdapat:
10/100 . 100 = 10 gram urea
air = 100-10= 90 gram air
jumlah mol urea= 10/60=0.16 mol
jumlah mol air = 90/18=5
fraksi mol urea= (0.16) : (0.16+5) =0,03
2014-09-09T14:22:30+07:00
Dik:terlarut 10 gr urea,mr 60
     pelarut 90 gr air,mr 18
dit:xterlarut
jawab:molt=gr/mr= 10/60= 0,17
         molp=gr/mr= 90/18= 5
         xt=molt/mol total = 0,17/0,17+5
                                   = 0,17/5.17
                                    =0,03