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Enter the compound formula, including state, of the missing substance ( Y ) in the balanced...

Enter the compound formula, including state, of the missing substance ( Y ) in the balanced equation below. Do not give the balancing coefficient. Look over your subscripts carefully.

Y + 3 Mg(NO2)2 (aq) → Mg3(PO3)2 (s) + 6 KNO2 (aq)

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