100-(19.33+53.78)=26.89\%
Na(x)S(y)O(z)= 19.33/23:53.78/32:26.89/16=0.84:1.68:1.68=1:2:2
NaS2O2
1) Zn+S-->ZnS
2)Hg+S-->HgS
3)<span>2ZnS + 3O2 = 2ZnO + 2SO2</span>
1)г 2)г 3)б 4)б 5)повышение температуры,
1) 4Al + 3O2 =2 Al2O3
2} Al2O3 + H2SO4 = Al2(SO4)3
3) Al2(SO4)3 + 6NaOH = 2Al(OH)3 +3 Na2SO4
4) Al(OH)3 + <span>3NaOH = Na3[Al(OH)6] </span>