Cu(OH)2-годроксид меди w-?
w-чего?
M(Cu(OH)2)=63.5+(16+1)*2=97.5 g/mol W(Cu)63.5/97.5*100%=65.13% W(O)=16*2/97.5*100%=32.82% W(H)=1*2/97.5*100%=2.05%