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A 4.1286 gram sample of the compound NaXPO3 was dissolved in water then reacted with excess...

  1. A 4.1286 gram sample of the compound NaXPO3 was dissolved in water then reacted with excess copper nitrate:

2NaXPO3(aq) + XCu(NO3)2(aq) →CuX(PO3)2(s) + 2XNaNO3(aq)

A total of 4.8639 grams of CuX(PO3)2 were collected. What is the value of X?

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