Understanding Avogadro's Number

Avogadro's number (6.022 x 10^23) represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance.

Calculation

1. Start with the moles of H2: 0.175 moles H2

2. Multiply by Avogadro's number: 0.175 moles H2 * (6.022 x 10^23 molecules H2 / 1 mole H2)

3. The 'moles' units cancel out, leaving you with the number of molecules: 1.05 x 10^23 molecules H2

Answer: There are approximately 1.05 x 10^23 molecules of H2 in 0.175 moles of H2.