The mass of 1 mol of atoms of an element is its ________ _______. How many moles of atoms are in each elemental sample? (Remember to use the correct number of significant figures in your answer. The first problem will have 2 sig figs and the rest will have 3 sig figs)
a. 4.6 x 10²4 Pb atoms = mol Pb
b. 2.87 x 10²2 He atoms = mol He