Answer:
9.52x10²⁰ sodium ions
Explanation:
First, we need to convert the mass in moles (n)
n = mass/molar mass
The moalr mass is given in g/mol, so let's transform the mass in gram:
1 g ------------ 1000 mg
x g------------- 99.6 mg
By a direct simple three rule:
1000x = 99.6
x = 0.0996 g
n = 0.0996/126.05
n = 7.90x10⁻⁴ mol of Na₂SO₃
The ionization reaction is:
Na₂SO₃ → 2Na⁺ + SO₃⁻
So, for 1 mol of Na₂SO₃, will be two moles of Na⁺ (sodium ion), then:
1 mol of Na₂SO₃ --------------- 2 moles of Na⁺
7.90x10⁻⁴ ------------------------- x
By a simple direct three rule:
x = 1.58x10⁻³ mol of Na⁺
Avogadro has related the number of moles with the number of the matter: atoms, ions, molecules. So, 1 mol has 6.02x10²³ ions.
1 mol ------------------- 6.02x10²³
1.58x10⁻³ mol ----------- x
By a direct simple three rule:
x = 9.52x10²⁰ sodium ions
