6Na+2H3PO4=2Na3PO4+3H2
3H2SO4+Al2O3=Al2(SO4)3+3H2O
2HNO3+CuO=Cu(NO3)2+H2O
Fe2(SO4)3+6NaOH=2Fe(OH)3+3Na2SO4
2Na+H2SO4=Na2SO4+H2
CO2+2KOH=K2CO3+H2O
3Na2SO3+2H3PO4=2Na3PO4+3SO2+3H2O
BaCl2+H2SO4=BaSO4+2HCl
1) n(BaSO4)=n(H2SO4)=0.2
2) m(H2SO4)=M(H2SO4)*n(H2SO4)=98*0.2=19.6
3)m(раствора)=m(H2SO4)/w(H2SO4)=19.6/0.2=98
Mr(Mg(PO4)2)=24+2*31+8*16=214
mMg=24/214=0.11=11%
mH=62/214=0.29=29%
mO=100-11-29=60%