Н2+S=H2S
n(H2S)=1000/34=29,4 моль.
m(H2)=29,4*2=58,8 г.
m(S)=29,4*32=941,2 г.
1) m(NaOH)=m(раствора)*w(NaOH)=200*0.2/100=0.4 г NaOH
Al₂O₃ = 2Al + 1,5 O₂ (электролиз)
2Al + 6HCl = 2AlCl₃ + 3H₂
AlCl₃ + 3KOH = Al(OH)₃ + 3KCl
Al(OH)₃ + 3HCl = AlCl₃ + 3H₂O
2Al(OH)₃ + Na₂O = 2NaAlO₂ + 3H₂O
4Al + 3O₂ = 2Al₂O₃
Al₂O₃ + 6HCl = 2AlCl₃ + 3H₂O
<span>Al₂O₃ + 2NaOH (тв) = 2NaAlO₂ + H₂O (t)</span>