Final answer:
In 120 g of sulfur, there are 3.75 moles and approximately 2.258 × 10^25 atoms, calculated using the molar mass of sulfur and Avogadro's number.
Step-by-step explanation:
To determine the number of moles and atoms in 120 g of sulfur, you first need to use the molar mass of sulfur. Since the molar mass of sulfur is 32 g/mol, you divide the total mass of sulfur by its molar mass to find the number of moles:
Number of moles = Mass of sulfur / Molar mass of sulfur = 120 g / 32 g/mol = 3.75 moles.
Next, to find the number of atoms, you multiply the number of moles by Avogadro's number (approximately 6.022 × 1023 atoms/mol):
Number of atoms = Moles of sulfur × Avogadro's number = 3.75 moles × 6.022 × 1023 atoms/mol = 2.258 × 1025 atoms.
Therefore, 120 g of sulfur contains 3.75 moles and approximately 2.258 × 1025 atoms.