Answer:
KNO₃ → 1 mol of K⁺ ; 1 mol of nitrate (1 mol of oxygen + 3 mol of nitrogen)
Na₂SO₄ → 2 mol of Na⁺ ; 1 mol of sulfate ( 1 mol of sulfur + 4 mol of oxygen)
Ca(OH)₂ → 1 mol of calcium; 2 moles of hydroxide
(NH₄)₂SO₃ → 2 mol of ammonium; 2 mol of sulfite (1 mol of sulfur + 3 mol of oxygen)
Ca₃(PO₄)₂ → 3 mol of calcium: 2 mol of phosphate (1 mol of phosphorus + 4 mol of oxygen)
Al₂(CrO₄)₃ → 2 mol of aluminum ; 3 mol of cromate (1 mol of Cr + 4 mol of oxygen)
Explanation:
Let's verify all the dissociations:
KNO₃ → K⁺ + NO₃⁻
Na₂SO₄ → 2Na⁺ + SO₄⁻²
Ca(OH)₂ → Ca²⁺ + 2OH⁻
(NH₄)₂SO₃ → 2NH₄⁺ + 2SO₃⁻²
Ca₃(PO₄)₂ → 3Ca²⁺ + 2PO₄⁻³
Al₂(CrO₄)₃ → 2Al³⁺ + 3CrO₄⁻²
