Here's how to calculate the number of molecules of hydrogen peroxide (H₂O₂) in 3.15 moles:

1. 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/mole.

2. Calculation:

* Step 1: Multiply the number of moles by Avogadro's number:

3.15 moles H₂O₂ * (6.022 x 10²³ molecules/mole) = 1.897 x 10²⁴ molecules

Answer: There are approximately 1.897 x 10²⁴ molecules of hydrogen peroxide in 3.15 moles.