In 1 mole of CaCl2 there are ____ moles of chloride ions.

A. 1
B. 2
C. 0.5
D. None of these

See my last answer.

D None of these

B. 2

To determine the number of moles of chloride ions in 1 mole of CaCl2, we need to understand the chemical formula of CaCl2.

In the chemical formula, the subscript number represents the number of atoms of each element in the compound. In this case, CaCl2 indicates one atom of calcium (Ca) and two atoms of chlorine (Cl).

Chloride ions (Cl-) are what we're interested in. Since there are two chlorine atoms in one mole of CaCl2, there are also two chloride ions. Therefore, the correct answer is B. 2 moles of chloride ions.