Question
complete chemical equation balance them : $\text{N}_2 +$ _______ $\rightarrow \text{NO}$

Answer

$\text{N}_2 + \text{O}_2 \rightarrow \text{NO}$
Element $\text{LHS}$ $\text{RHS}$
$\text{N}$ $2$ $1$
$\text{O}$ $2$ $1$
Multiply $\text{NO}$ by $2,$ we get
$\text{N}_2 + \text{O}_2\rightarrow \text{NO}$
Element $\text{LHS}$ $\text{RHS}$
$\text{N}$ $2$ $2$
$\text{O}$ $2$ $2$
Since the number of atoms of each element is equal on both sides, it is balanced now.

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