Question: how many atoms are in one molecule of ammonium dichromate?
Answer: (NH₄)₂Cr₂O₇ is the formula for ammonium dichromate. Multiply these by Avogadro's constant (6.02 × 10²³) and that will be the number of atoms for each element in one mole of ammonium dichromate. Nitrogen: 1.20 × 10²⁴ atoms.