There are 1.65 × 10^(-7) g S in 3.01 × 10^15 atoms S.
Step 1. Use Avogadro’s number to convert atoms of S to moles of S
Moles of S = 3.01 × 10^15 atoms S × (1 mol S/6.022 × 10^23 atoms S)
= 5.148 × 10^(-9) mol S
Step 2. Use the molar mass of S to convert moles of S to grams of S
Mass of S = 5.148 × 10^(-9) mol S × (32.06 g S/1 mol S) = 1.65 × 10^(-7) g S
