Which sample contains the fewest number of atoms?
A) 216 g Cr
B) 435 g Ni
C) 512 g Mn
D) 619 g Pt
E) 642 g Rb

Question

Quizplus · Accepted Answer

The number of atoms in a sample can be determined by dividing the mass of the sample by the molar mass of the element to find the number of moles, and then multiplying by Avogadro's number (6.022 x 10^23 atoms/mole). The element with the highest molar mass will have the fewest atoms if the masses of the samples are similar. Among the given options, Pt (Platinum) has the highest molar mass (~195 g/mol), making the 619 g sample of Pt contain the fewest number of atoms.

Which Sample Contains the Fewest Number of Atoms