13. Consider equal mole samples of $\text{N}_2\text{O}$, $\text{Al}(\text{NO}_3)_3$, and $\text{KCN}$. Which one has the most number of nitrogen atoms in each sample?
(A) $\text{N}_2\text{O}$
(B) $\text{Al}(\text{NO}_3)_3$
(C) $\text{KCN}$
(D) All are the same

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