# P and Q

Chemistry Level 3

$$\ce P$$ and $$\ce Q$$ are two elements which form $$\ce{P2Q3}$$ and $$\ce{PQ2}$$ molecules. If $$0.15\text{ mole}$$ of $$\ce{P2Q3}$$ and $$\ce{PQ2}$$ weighs $$15.9\text{ g}$$ and $$9.3\text{ g}$$, respectively, what is the sum of atomic masses of $$\ce P$$ and $$\ce Q$$ ?

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