Mr(SO3) = 80
w(s)=32:80*100%=40%
w(o)=48:80=60%
Mr(CuSO4)=160
w(Cu)=64:160*100%=40%
w(S)=32:160*100%=20%
w(O)=64:160*100%=40%
Mr(SO3) = 80
w(s)=32:80*100%=40%
w(o)=48:80=60%
Mr(CuSO4)=160
w(Cu)=64:160*100%=40%
w(S)=32:160*100%=20%
w(O)=64:160*100%=40%