1 molecule of N2H4 contains 2 nitrogen atoms and 4 hydrogen atom.
Total atoms = 6
1 mole N2H4 is 6.022*1023 molecules - (Avogadro number)
3 moles N2H4 = 3*6.022*1023 molecules = 18.066*1023 molecules
Number of atoms in 3 moles of N2H4 = 6*18.066*1023 = 108.396*1023 atoms= 1.08396*1025 atoms
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