To calculate the mass of a 2.0 mole sample of lead, we need to know the molar mass of lead. The molar mass of lead is 207.2 g/mol. This means that 1 mole of lead has a mass of 207.2 grams. Therefore, 2.0 moles of lead will have a mass of 2.0 x 207.2 = 414.4 grams.