For which of the following is the van't Hoff factor 2, assuming complete dissociation? a) Calcium phosphateb) Aluminum chloridec) Calcium chlorided) Sodium chloride

Van't Hoff factor is 2, in the sodium chloride

Explanation:

Let's raise the dissociations

Ca₃ (PO₄) ₂ → 3Ca²⁺ + 2PO₄⁻³

We have 5 moles of ions

AlCl₃ → Al³⁺ + 3Cl⁻

We have 4 moles of ions

CaCl₂ → Ca²⁺ + 2Cl⁻

We have 3 moles of ions

NaCl → Na⁺ + Cl⁻

We have 2 moles of ions