# Chemistry

In a chemical reaction, 10 moles of the element aluminum react with 7.5 moles of oxygen gas. This produces 5 moles of aluminum oxide (Al2O3).

20Al + 15O2 → 10Al2O3
4Al + 3O2 → 2Al2O3
Al + O2 → Al2O3
10Al + 7.5O2 → 5Al2O3

D?10Al + 7.5O2 → 5Al2O3

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1. What's the question? I assume you want to know the equation?
Balance the equations. C is not balanced. A, B, D are balanced BUT what is the one with the lowest coefficients?

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