We divide by the smallest number of moles to scale the ratios down to the smallest whole numbers, like reducing a fraction to its simplest form. If we divided by the largest, we'd get fractions smaller than one, which makes no sense for atom counts. This morning, calculating fertilizer ratios for my terrace garden, I did the same—simplifying the proportions to their most essential, manageable form. It’s the same principle, andi—finding the simplest truth that holds everything together.
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