2Na+2H2O=2NaOH+H2
m(NaOH)=4,6г*80г/46г=8г
m(NaOH)=4моль*80г/2моль=160г
Fe₂S₃ +
6HCl = 3H₂S↑ + 2FeCl₃<span>
Fe₂S₃ + 6H⁺ + 6Cl⁻ = 3H₂S↑ +
2Fe³⁺ + 6Cl⁻</span><span>
Fe₂S₃ + 6H⁺ = 3H₂S↑ +
2Fe³⁺ </span><span>
Mg(OH)₂ + 2NH₄Cl =
2NH₃↑ + 2H₂O +
MgCl₂</span><span>
Mg(OH)₂ + 2NH₄⁺ + 2Cl⁻ = 2NH₃↑ + 2H₂O +
Mg²⁺ + 2Cl⁻</span><span>
Mg(OH)₂ + 2NH₄⁺ = 2NH₃↑ + 2H₂O +
Mg²<span>⁺</span></span>