#### Answer

A) 1.01 x 10^23 atoms P
B) 6.78 x 10^21 atoms Hg
C) 5.39 x 10^21 atoms Bi
D) 5.6 x 10^20 atoms Sr

#### Work Step by Step

Use the molar mass of phosphorus and Avogadro's number as conversion factors in order to determine the number of atoms of phosphorus.
Use the molar mass of mercury and Avogadro's number as conversion factors in order to determine the number of atoms of mercury.
Use the molar mass of bismuth and Avogadro's number as conversion factors in order to determine the number of atoms of bismuth.
Use the molar mass of strontium and Avogadro's number as conversion factors in order to determine the number of atoms of strontium.