Understanding the Concepts

* Moles: A mole is a unit of measurement representing a specific number of particles (atoms, molecules, etc.). One mole contains 6.022 x 10^23 particles (Avogadro's number).

* Chemical Formula: The formula H₃PO₄ tells us that one molecule of phosphoric acid (H₃PO₄) contains one phosphorus (P) atom.

Calculation

1. Atoms of P per mole: Since one mole of H₃PO₄ contains one mole of phosphorus atoms, 1.50 moles of H₃PO₄ contain 1.50 moles of P atoms.

2. Total P atoms:

* 1.50 moles P * (6.022 x 10^23 atoms P / 1 mole P) = 9.033 x 10^23 atoms P

Answer: 1.50 moles of H₃PO₄ contain 9.033 x 10^23 phosphorus atoms.