Answer:
1.48 × 10²⁵ Ions
Solution:
Calcium Nitrate having a chemical formula Ca(NO₃)₂ is made up of one Ca²⁺ cation and two NO₃⁻ anions. Hence, we can say that each Calcium Nitrate contains three ions respectively.
Therefore,
1 mole of Ca(NO₃)₂ contains = 6.022 × 10²³ formula Units
So,
8.2 mole of Ca(NO₃)₂ will contain = X Formula Units
Solving for X,
X = (8.2 mol × 6.022 × 10²³ formula units) ÷ 1 mol
X = 4.93 × 10²⁴ Formula Units
As discussed,
1 Formula Unit of Ca(NO₃)₂ contains = 3 Ions
So,
4.93 × 10²⁴ Formula units will contain = X ions
Solving for X,
X = (4.93 × 10²⁴ Formula Unit × 3 Ions) ÷ 1 Formula Unit
X = 1.48 × 10²⁵ Ions