# Is the following reaction synthesis or decomposition?

## ${N}_{2} \left(g\right)$ + ${O}_{2} \left(g\right)$ $\to$ $2 N O \left(g\right)$

In this case, nitrogen gas, ${\text{N}}_{2}$, and oxygen gas, ${\text{O}}_{2}$, react to form nitric oxide, $\text{NO}$. Notice that two reactants are used up and a single product is formed $\to$ a synthesis reaction took place.