1. Understand the Chemical Formula:

* H₂SO₄ represents sulfuric acid.

* The subscript "2" after the hydrogen (H) indicates that there are two hydrogen atoms in each molecule of sulfuric acid.

2. Avogadro's Number:

* Avogadro's number tells us the number of particles (atoms, molecules, etc.) in one mole of a substance. It's approximately 6.022 x 10²³ particles/mol.

3. Calculations:

* Step 1: Calculate the number of H₂SO₄ molecules in 0.1262 mol:

0.1262 mol H₂SO₄ x (6.022 x 10²³ molecules/mol) = 7.60 x 10²² molecules of H₂SO₄

* Step 2: Calculate the total number of hydrogen atoms:

7.60 x 10²² molecules of H₂SO₄ x (2 H atoms/molecule) = 1.52 x 10²³ hydrogen atoms

Answer: There are approximately 1.52 x 10²³ hydrogen atoms in 0.1262 mol of H₂SO₄.