1)Ba(OH)2+2HCl=BaCl2+2H2O
m(Ba(OH)2)=200*8.55/100=17.1г
m(BaCl2)=17.1*208/171=20.8г
m(H2O)=17.1*36/171=3.6г
2)H3PO4+3NaOH=Na3PO4+3H2O
m(NaOH)=150*8/100=12г
m(Na3PO4)=12*164/120=16.4г
m(H2O)=12*54/120=5.4г
3)2HCl+ZnO=ZnCl2+H2O
m(HCl)=400*7.3/100=29.2г
m(ZnCl2)=29.2*136/73=54.4г
m(H2O)=29.2*18/73=7.2г