Jawabanmu

2014-08-12T17:31:40+07:00
% = massa terlarut / massa larutan
25 / 100 = massa terlarut / massa larutan
massa pelarut = 100 - 25 = 75 gr
m = gr / Mr x 1000 / massa pelarut
    = 25/60 x 1000/75
    = 25000 / 4500
    = 5,56 m