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Question

P and Q are two elements which form P2Q3 and PQ2. If 0.15 mole of P2Q3 weighs 15.9 g and 0.15 mole of PQ2 weighs 9.3 g. The atomic mass of Q is

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Solution

Suppose atomic masses of P and Q are X and Y respectively.
Molar mass of P2Q3=2X+3Y
and Molar mass of PQ2=X+2Y
Now Mole=massmolarmass
2X+3Y=15.9/0.15....(i)
and X+2Y=9.3/0.15....(ii)
Solving these equations, we get X=2.6gmol1,Y=18gmol1
So, atomic mass of Q is 18.

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