Final answer:
The reactants for the chemical equation CaO + Na3PO4 → Na2O + Ca3(PO4)2 are calcium oxide (CaO) and sodium phosphate (Na3PO4).
Step-by-step explanation:
The reactants for the reaction CaO + Na3PO4 → Na2O + Ca3(PO4)2 are calcium oxide (CaO) and sodium phosphate (Na3PO4). To balance the chemical equation, one needs to adjust the coefficients so that the number of atoms for each element is the same on both sides of the equation. It appears that there might be a typo in the provided chemical equation, as it does not balance in terms of the sodium (Na) atoms. A likely balanced form of this reaction would be 3CaO + 2Na3PO4 → 6Na2O + Ca3(PO4)2, ensuring that both calcium and sodium are balanced.