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P and Q are two elements which from P(2)...

`P` and `Q` are two elements which from `P_(2)Q_(3),PQ_(2)` molecules. If `0.15 "moles of" P_(2)Q_(3)` and `PQ_(2)` weighs `15.9 g` and `9.3 g`, respectively, what are atomic weighs of `P` and `Q`?

Text Solution

Verified by Experts

Let at. wt. of `P` and `Q` be `a` and `b` respectively,
`:.` Mol. wt. of `P_(2)Q_(3)= 2a+3b`
and Mol. wt. of `PQ_(2)= a+2b`
`:. (2a+3b)xx0.15 = 15.9`
and `(a+2b)xx0.15=9.3`
`( :. Wt. "Mole"xxMol.wt.)`
Thus, `a= 26, b= 18`
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Knowledge Check

  • P and Q are two elements which form P_2Q_3, PQ_2 molecules. If 0.15 mole of P_2Q_3 and PQ_2 weighs 15.9 g and 9.3 g, respectively, what are atomic weighs of P and Q respectively.

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