(b) An unknown mass of Na;PO<(s) is dissolved in water to form 50.00 mL of solution. This is Solution A. Then 10.00 mL of Solution A is diluted with water to 50.00 mL. The final solution is Solution B. 20.00 mL of Solution B contains 4.408 × 1020 sodium ions. (NA = 6.022 × 1023 mol-1) Calculate the mass of Na3PO4(s) that was dissolved to form Solution A.

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