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Why students struggle with Avogadro's law, molar volume at STP ($22.4\text{ L}$), and limiting reagent calculations.
Stoichiometry requires bridging microscopic atomic entities ($6.022 \times 10^{23}$) with macroscopic laboratory measurements (grams and liters).
Always convert the given quantity into moles first ($n = \frac{\text{Mass}}{\text{Molar Mass}}$ or $n = \frac{\text{Volume at STP}}{22.4\text{ L}}$). Use stoichiometric coefficients from the balanced equation to determine product moles, and only then convert back into the target unit.
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