1. <span>2 Na + 2 H2O = H2 + 2 NaOH
</span><span>Na2CO3 + H2O = CO2 + 2 NaOH</span>
2. <span>Ba(OH)2 + 2 HCl = BaCl2 + 2 H2O
</span><span>Ba(OH)2 + CuCl2 = BaCl2 + Cu(OH)<span>2
</span></span>3. <span>Na2CO3 = CO2 + Na2O
</span><span>Na2CO3 + H2O = CO2 + 2 NaOH
</span>4. <span>Fe + 2 HCl = FeCl2 + H<span>2
</span></span>Fe + CuCl2 = FeCl2 + Cu
CuSO4+2NaOH=Cu(OH)2+Na2SO4
32г x г
CuSO4=Cu(OH)2
160г 98г
x=32×98/160=19.6 г