Question

1. balance the combination reaction between iron and oxygen by dragging coefficients into the equation.

? fe +? o₂ →? fe₂o₃
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Explanation:

Step1: Balance oxygen atoms

We have 2 oxygen atoms in $O_2$ and 3 oxygen atoms in $Fe_2O_3$. The least - common multiple of 2 and 3 is 6. So we put a 3 in front of $O_2$ and a 2 in front of $Fe_2O_3$.
$Fe+3O_2
ightarrow2Fe_2O_3$

Step2: Balance iron atoms

Now, on the right - hand side, we have 4 iron atoms in $2Fe_2O_3$. So we put a 4 in front of $Fe$ on the left - hand side.
$4Fe + 3O_2
ightarrow2Fe_2O_3$

Answer:

4, 3, 2