The chemical reaction between Barium chloride and Na3PO4 takes place as follows:
2 moles of 
reacts with 3 moles of 
.
Thus, 1.5 moles of are required to react with 1 mol of in order for the reaction to be completed.
1.5 moles of BaCl2 are required in order to react completely with 1 mole of Na3PO4.
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The correct answer is D- the balance between the concentrations inside and outside a cell
