Final answer:
The average mass of a single silicon atom is 4.66 × 10^-23 g.
Step-by-step explanation:
The average mass of a single silicon atom can be calculated by dividing its molar mass by Avogadro's number. The molar mass of silicon is 28.0855 g/mol. Avogadro's number is 6.022 × 10^23 atoms/mol. Therefore, the average mass of a single silicon atom is (28.0855 g/mol) / (6.022 × 10^23 atoms/mol) = 4.66 × 10^-23 g.