Calculating number of moles from solution

Choose the right answer from following. If 0.50 mol of CaCl₂ is mixed with 0.20 mol of Na₃PO₄, the maximum number of moles of Ca₃ (PO₂)₂ which can be formed: (a) 0.70 (b) 0.50 (c) 0.20 (d) 0.10

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