Atoms of three different elements are represented by (mathrm{O}), (square), and (Delta). Which compound is left over

Question:

Atoms of three different elements are represented by $\mathrm{O}$, $\square$, and $\Delta$. Which compound is left over when three molecules of $\mathrm{O} \Delta$ and three molecules of $\square \square \Delta$ react to form $\mathrm{O} \square \Delta$ and $\mathrm{O} \Delta \Delta$ ?

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