# What is the molar mass of the isotope lead-208 (208Pb)?

$208 \cdot g \cdot m o {l}^{-} 1$
The isotopic notation ""^(208)Pb specifies the number of neutrons and protons, i.e. massive nuclear particles. Of course, we know $Z$, the number of nuclear protons, or we would know if we looked up the atomic number of $P b$. This is your job.