Jawabanmu

2014-05-22T19:36:59+07:00
A. % massa H = 2 x Ar H / Mr H2O x 100 % = 2 / 18 x 100% = 11,1 %
 % massa O = 1 x Ar O / Mr H2O x 100% = 16 / 18 x 100% = 88,9 %