Given the reaction: 2Al2O3 → 4Al + 3O2, how many moles of Al would be produced from 20 moles of Al2O3?

• A. 30 moles
• B. 40 moles
• C. 20 moles
• D. 10 moles

Answer: (B)

Verified step by step guidance

1. Identify the balanced chemical equation: \$2Al_2O_3 \rightarrow 4Al + 3O_2$.
2. Determine the mole ratio between \(Al_2O_3\) and \(Al\) from the balanced equation. For every 2 moles of \(Al_2O_3\), 4 moles of \(Al\) are produced.
3. Set up a proportion to find the moles of \(Al\) produced from 20 moles of \(Al_2O_3\): \(\frac{4\ \text{moles } Al}{2\ \text{moles } Al_2O_3} = \frac{x\ \text{moles } Al}{20\ \text{moles } Al_2O_3}\).
4. Solve for \(x\) by cross-multiplying and dividing: \(x = \frac{4}{2} \times 20\).
5. Interpret the result as the number of moles of \(Al\) produced from 20 moles of \(Al_2O_3\).