Question

in the reaction _ al + 3o₂ → 2al₂o₃, what coefficient should be placed in front of the al to balance the reaction? 1 2 3 4

Explanation:

Step1: Count the number of \(Al\) atoms on the product side

On the product side (\(2Al_2O_3\)), the number of \(Al\) atoms is \(2\times2 = 4\).

Step2: Balance the \(Al\) atoms on the reactant side

Since there are 4 \(Al\) atoms on the product side, we need 4 \(Al\) atoms on the reactant side. So the coefficient in front of \(Al\) should be 4. The balanced equation is \(4Al + 3O_2
ightarrow2Al_2O_3\).

Answer:

D. 4