To determine the number of ions or atoms of calcium and chloride in 1.5 moles of CaCl2, we need to consider the chemical formula and Avogadro's number.

1. Calcium (Ca) ions:

- Each formula unit of CaCl2 contains one calcium (Ca) ion.

- In 1.5 moles of CaCl2, there are 1.5 moles of Ca ions.

- Avogadro's number tells us that 1 mole of any substance contains 6.022 × 10^23 particles (atoms, ions, or molecules).

- Therefore, 1.5 moles of CaCl2 contain 1.5 moles × 6.022 × 10^23 particles/mole = 9.033 × 10^23 Ca ions.

2. Chloride (Cl) ions:

- Each formula unit of CaCl2 contains two chloride (Cl) ions.

- In 1.5 moles of CaCl2, there are 1.5 moles of Cl ions (since each CaCl2 molecule contributes two Cl ions).

- Therefore, 1.5 moles of CaCl2 contain 1.5 moles × 6.022 × 10^23 particles/mole = 9.033 × 10^23 Cl ions.

So, in 1.5 moles of CaCl2, there are 9.033 × 10^23 calcium ions (Ca^2+) and 9.033 × 10^23 chloride ions (Cl^-).