Answer
Moles Pb²⁺ = 8.75 x 10⁻⁵ mol
Explanation
The unit of concentration (that is molarity) is mol/L, therefore, the unit of volume must be in liters to get the moles of Pb^2+
Given that:
Molarity of Pb(NO₃)₂ = 0.25 M
Volume of Pb²⁺ = 0.35 mL = (0.35/1000) = 3.5 x 10⁻⁴ L
What to find:
The moles of Pb²⁺.
Solution:
Moles Pb²⁺ = [Pb(NO₃)₂] x V Pb²⁺
Moles Pb²⁺ = 0.25 M x 3.5 x 10⁻⁴ L
Moles Pb²⁺ = 8.75 x 10⁻⁵ mol
