Jawabanmu

2014-06-10T21:35:13+07:00
Mr Al_2(SO_4)_3.X(H_2O) = 2 Ar Al + 3 Ar S + 12 Ar O + x Ar O + 2x Ar H
450 = 2(27) + 3(32) + 12(16) + 16(x) + 2x
18x = 108
x = 108/18
x = 6
mungkin itu nyari koefisien H2O.