Tells me atoms, the 2 in H₂O, the 2 in CO₂, the 6 in C₆H₁₂O₆, the 3 in 4NH₃, Tells me molecules, the 3 in front of 3NaCl, the 5 in front of 5O₂, the 1 in CO₂, the 4 in 4NH₃

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