Answer:
0.006456 grams.
Step-by-step explanation:
To calculate the mass of atoms, we need to know the molar mass of sulfur (S). The molar mass of sulfur is approximately 32.06 grams per mole.
To find the mass of 1.21 × 10^20 atoms of sulfur, we can use the following steps:
Calculate the number of moles by dividing the number of atoms by Avogadro's number (6.022 × 10^23):
Number of moles = (1.21 × 10^20 atoms) / (6.022 × 10^23 atoms/mol)
Multiply the number of moles by the molar mass of sulfur to find the mass:
Mass = (Number of moles) × (Molar mass of sulfur)
Let's perform the calculations:
Number of moles = (1.21 × 10^20) / (6.022 × 10^23) ≈ 2.011 × 10^(-4) moles
Mass = (2.011 × 10^(-4)) × (32.06 grams/mol) ≈ 0.006456 grams
Therefore, the mass of 1.21 × 10^20 atoms of sulfur is approximately 0.006456 grams.