Question

Calculate the following for 49 gm of H₂SO₄ 

(a) moles 

(b) Molecules 

(c) Total H atoms 

(d) Total O atoms

(e) Total electrons 

Answer 1

Correct option: (e) Total electrons

Explanation:

Molecular wt of H₂SO₄ = 98

(b) Since 1 mole = 6.023 × 10²³ molecules. 

1/2 mole = 6.023 × 10²³ × 1/2 molecules = 3.011 × 10²³ molecules

(c) 1 molecule of H₂SO₄ Contains 2 H atom

3.011 × 10²³ of H₂SO₄ contain 2 × 3.011 × 10²³ atoms = 6.023 × 10²³ atoms

(d) 1 molecules of H₂SO₄ contains 4 O atoms

3.011 × 10²³ molecular of H₂SO₄ contains = 4 × 3.011 × 10²³ = 12.044 × 10²³

(e) 1 molecule of H₂SO₄ contains 2H atoms + 1 S atom + 4 O atom

this means 1 molecule of H₂SO₄ Contains (2 + 16 + 4 × 8) e–

So 3.011 × 10²³ molecules have 3.011 × 10²³ × 50 electrons = 1.5055 × 10²⁵ e–