Answer:
3.50 × 10²³ Atoms of Se
Explanation:
As we know that 1 mole of any substance contains exactly 6.022 × 10²³ particles which is also called as <em>Avogadro's Number</em>. So in order to calculate the number of particles (atoms) contained by 0.580 moles of Se, we will use following relation,
Moles = Number of Atoms ÷ 6.022 × 10²³ Atoms.mol⁻¹
Solving for Number of Atoms,
Number of Atoms = Moles × 6.022 × 10²³ Atoms.mol⁻¹
Putting values,
Number of Atoms = 0.580 mol × 6.022 × 10²³ Atoms.mol⁻¹
Number of Atoms = 3.50 × 10²³ Atoms
Hence,
There are 3.50 × 10²³ atoms present in 0.280 moles of Se.
