P2O5+ 3H2O=2H3PO4; 2H3PO4 + 3Ca(OH)2=Ca3(PO4)2+ 6H2O.
3CaCl2+2H3PO4=Ca3(PO4)2+6HCL
3CaBr2+2Na3PO4=Ca3(PO4)2+6NaBr
FeCl3+3KOH=Fe(OH)3+3KCl
FeBr3+3NaOH=Fe(OH)3+3NaBr
2HCl+K2S=H2S+2KCl
2HBr+Na2S=2NaBr+H2S
<em> FeO-основный оксид
======================</em>
H3C C (CH3) CH2 +Br2= H3CCBr (CH3) CH3Br
n (h3c(ch3)ch2= 19.5÷56=0.35moл
n (br2)=0.35mol
м (br2)=0.35×(80×2)
=56г