Определите w(s) в CaSo4* 2H2О

M(CaSO4)=40+32+4*16=140 W(Ca)=40:140=28,5% W(S)=32:140=23% W(4O)=68:140=48,5% M(2H2O)=2*(2*1+16)=36 W(2H2)=2*(2*1)=4:36=11% W(2O)=(2*16):36=89%