# (3) 3. How many grams of oxygen are present in a sample containing 5.75 x 1021...

###### Question:

(3) 3. How many grams of oxygen are present in a sample containing 5.75 x 1021 formula units of manganese (II) phosphate ? (6) 4. Determine the percent composition (by mass) for each element in ammonium dichromate, (NH4)2Cr2O7.

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