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Your compound's chemical formula is (NH4)2Cr2O7 - so you can see that it contains 2 moles of NH4+ per mole of the salt. So in 7 moles you have 14 moles of ammonium, containing 14 moles of N atoms which means that you have

(1 mole = 6,022*10^23 atoms)

14 mols * 6,022*10^23 atoms/mole = 8,43*10^23 atoms

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Q: How many nitrogen atoms would be present in 7 moles of NH42C2O4?
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