Galena is the mineral form of lead sulfide (PbS). To calculate the percent composition of Pb and Fe in galena, we need to understand a few things:

* Galena does not contain iron (Fe). It is a compound of lead (Pb) and sulfur (S).

* Percent composition is the percentage by mass of each element in a compound.

Let's calculate the percent composition of Pb and S in galena:

1. Find the molar mass of PbS:

* Pb: 207.2 g/mol

* S: 32.06 g/mol

* Molar mass of PbS = 207.2 + 32.06 = 239.26 g/mol

2. Calculate the mass percent of Pb:

* (Mass of Pb / Molar mass of PbS) * 100%

* (207.2 g/mol / 239.26 g/mol) * 100% = 86.6%

3. Calculate the mass percent of S:

* (Mass of S / Molar mass of PbS) * 100%

* (32.06 g/mol / 239.26 g/mol) * 100% = 13.4%

Therefore, the percent composition of galena is 86.6% lead (Pb) and 13.4% sulfur (S).