Ответ:
S + H₂ = H₂S
H₂S + 2KOH = K₂S + 2H₂O
K₂S + 2HCl = H₂S + 2KCl
H₂S + NaOH = Na₂S + 2H₂O
P₂O₅ + 3H₂O = 2H₃PO₄
H₃PO₄ + 3NaOH = Na₃PO₄ + 3H₂O
2Na₃PO₄ + 3CaCl₂ = Ca₃(PO₄)₂ + 6NaCl
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Ответ:
S + H₂ = H₂S
H₂S + 2KOH = K₂S + 2H₂O
K₂S + 2HCl = H₂S + 2KCl
H₂S + NaOH = Na₂S + 2H₂O
P₂O₅ + 3H₂O = 2H₃PO₄
H₃PO₄ + 3NaOH = Na₃PO₄ + 3H₂O
2Na₃PO₄ + 3CaCl₂ = Ca₃(PO₄)₂ + 6NaCl