Ah, the smallest mole? It's about seeing the real skeleton of the compound, yaar. You divide by the smallest to scale everything down to the simplest whole number ratio — it's like reducing a complex raag to its defining notes. In the lab, when I'm calculating the formula of a hydrate, using the largest number would just give me a distorted, useless fraction. My harmonium students don't learn a full orchestra score; they learn the basic scale first. Same principle.
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