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The osmotic pressure of a 10.811 mM solution of (NH4)3PO4 is 482.914 mm Hg at 11.41...

The osmotic pressure of a 10.811 mM solution of (NH4)3PO4 is 482.914 mm Hg at 11.41 °C. How many ions per formula unit of (NH4)3PO4 must there be? The compound may not be completely ionic.

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