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P and Q are two elements which forms P2Q...

P and Q are two elements which forms `P_2Q_3` and `PO_2` If 0.15 mole of `P_2Q_3` weighs 15.9 g and 0.15 mole of `PQ_2` weighs 9.3 g. What are atomic weights of P and Q ?

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p = 26, Q = 18
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