Calculate the percent of lead in Pb (Co3) 2

We will take that molar mass of Pb (CO3) 2 represents the total mass of all particles in this compound, ie it has value 100%.

M (Pb (CO3) 2) = Ar (Pb) + 2xAr (C) + 6xAr (O) = 207.2 + 2x12 + 6x16 = 327.2 g/mol

M (Pb) = 207.2 g/mol

From the date above we can set the following ratio:

M (Pb (CO3) 2) : M (Pb) = 100% : x

327.2 : 207.2 = 100 : x

x = 63.33% of Pb there is in Pb (Co3) 2