Question

How many oxygen atoms are in 4.5g of H2SO4

Answer 1

atoms of oxygen = 1.1 x 10²³ atoms

Explanation

Given : mass of H₂SO₄ = 4.5 g

molar mass of H₂SO₄ = 98.08 g/mol

moles of H₂SO₄ = (mass of H₂SO₄) / (molar mass of H₂SO₄)

moles of H₂SO₄ = (4.5 g) / (98.08 g/mol)

moles of H₂SO₄ = 0.04588 mol

molecules of H₂SO₄ = (moles of H₂SO₄) * N_A

where N_A = Avagadro's number = 6.022 x 10²³ molecules/mol

molecules of H₂SO₄ = (0.04588 mol) * (6.022 x 10²³ molecules/mol)

molecules of H₂SO₄ = 2.763 x 10²² molecules

Each molecule of H₂SO₄ has 4 atoms of oxygen

atoms of oxygen = 4 x molecules of H₂SO₄

atoms of oxygen = 4 * 2.763 x 10²² molecules

atoms of oxygen = 1.1 x 10²³ atoms