#### Answer

A) 1.732 x 10^23 atoms Cr
B) 7.462 x 10^23 atoms S
C) 3.982 x 10^22 atoms Pt
D) 4.949 x 10^23 atoms Sn

#### Work Step by Step

Use the molar mass of chromium and Avogadro's number as conversion factors in order to determine the number of atoms of chromium.
Use the molar mass of sulfur and Avogadro's number as conversion factors in order to determine the number of atoms of sulfur.
Use the molar mass of platinum and Avogadro's number as conversion factors in order to determine the number of atoms of platinum.
Use the molar mass of tin and Avogadro's number as conversion factors in order to determine the number of atoms of tin.