1. For each of the following write the dissociation equation, indicate the number of moles of each reactant and product, and the total number of moles of ions produced.

a) 1 mol of ammonium chloride
b) 0.5 mol of ammonium chloride
c) 1 mol of sodium sulfide
d) 0.5 mol of barium nitrate
e) 0.5 mol of strontium nitrate, Sr(NO3)2
f) 2 mol of KI
g) 1 mol of NaNO3
h) 4 mol of MgCl2
i) 2 mol of Na2SO4

a) NH₄Cl ---> NH4⁺¹ + Cl^{-1
ratio is 1:1:1 thus one mole of ammonium chloride, one mole of ammonium ion and one mole of chloride ion; total number of ions produced is two moles.}

b) NH₄Cl ---> NH4⁺¹ + Cl^-1
ratio is 1:1:1 thus 0.5 mol of ammonium chloride, 0.5 mol of ammonium ion and 0.5 mol of chloride ion; total number of ions produced is 1 mol.

c) Na₂S ---> 2Na⁺¹ + S^-2
ratio is 1:2:1 thus 1 mole of sodium sulfide, two moles of sodium ions, one mole of sulfide ions; total number of ions produced is three moles.

d) Ba(NO₃)₂ ---> Ba⁺² + 2NO₃^-1
ratio is 1:1:2 thus 0.5 mol of barium nitrate, 0.5 mol of barium ion and 1 mole of nitrate ions; total number of ions is 1.5 moles.

e) Sr(NO₃)₂ ---> Sr⁺² + 2 NO₃^-1
ratio is 1:1:2 thus 0.5 mol of strontium nitrate, 0.5 mol of strontium ion, and 1 mole of nitrate ions; total number of ions is 1.5 moles.

f) KI ---> K⁺¹ + I^-1
ratio is 1:1:1 thus 2 mol of potassium iodide, 2 mol of potassium ions, and two moles of iodide ions; total number of ions is 4 moles.

g) NaNO₃ ---> Na⁺¹ + NO₃^-1
ratio is 1:1:1 thus 1 mol of sodium nitrate, 1 mole of sodium ions, and 1 mole of iodide ions; total number of ions is 2 moles.

h) MgCl₂ ---> Mg⁺² + 2Cl^-1
ratio is 1:1:2 thus 4 moles of magnesium chloride, 4 moles of magnesium ions, and 8 moles of chloride ions; total number of ions is 12 moles.

i) Na₂SO₄ ---> 2 Na⁺¹ + SO₄^-2
ratio is 1:2:1 thus 2 moles of sodium sulfate, 4 moles of sodium ions, and 2 moles of sulfate ions; total number of ions is 6 moles.