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M.W. of the given compound is 3x23+1x31+4x16=164

in Na3PO4 3 moles of Na+ ions are produces

i.e., 1mole weighs 164g contain 3x6.023x10^23 Na+ ions

?5.43g contain = 5.43g x 3 moles Na+ x 6.023x10^23 / 164 g/mol

Na+ ions=0.598x10^23

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