Answer:
6.022 × 10²³ Molecules of Na₂SO₄
Explanation:
Mole is an amount unit. One mole of any substance contains exactly 6.022 × 10²³ particles which is also called as Avogadro's Number. So in order to calculate the number of molecules contained by 1 mole (incase if the moles given are not 1 then following method is used) of Na₂SO₄, we will use following relation,
Moles = Number of Molecules ÷ 6.022 × 10²³ Molecules.mol⁻¹
Solving for Number of Molecules,
Number of Molecules = Moles × 6.022 × 10²³ Molecules.mol⁻¹
Putting values,
Number of Molecules = 1.0 mol × 6.022 × 10²³ Molecules.mol⁻¹
Number of Molecules = 6.022 × 10²³ Molecules of Na₂SO₄
Hence,
There are 6.022 × 10²³ Molecules present in 0.280 moles of Br₂.
