How many chloride ions are in a 220 grams of calcium chloride?

The Ions present in CaCl₂ are,

                                                 Ca²⁺    Cl⁻     Cl⁻

Means 1 formula unit contains 1 Ca²⁺ ion and 2 Cl⁻ ions.

Also, 1 mole of CaCl₂ contains 6.022 × 10²³ formula units.

So, 1 mole formula units of CaCl₂ contain,

                                            2 × 6.022 × 10²³  =  1.20 × 10²⁴ Cl⁻ Ions

Now, Calculating number of moles contained by 220 g of CaCl₂,
As,
                               110.98 g of CaCl₂  =  1 mole
Then, 
                                    220 g of CaCl₂  =  X moles
Solving for X,
                                                 X  =  (220 g × 1 mol) ÷ 110.98 g

                                                 X  =  1.98 moles
As,
                           1 mole contained  =  1.20 × 10²⁴ Cl⁻ Ions
Then,
                    1.98 mole will contain  =  X Cl⁻ Ions
Solving for X,
                                                  X  =  (1.98 mol × 1.20 × 10²⁴ Ions) ÷ 1mol

                                                  X  =  2.38 × 10²⁴ Cl⁻ Ions

Answer is to avoid experimental error

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.