Question

P and Q are the two elements when combined they form P2Q3 and PQ2 . if the weight of 0.15 mole of P2Q3 is 15.9g and 0.15 mole PQ2 is 9.3g then find atomic weight of P and Q​

Answer 1

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Answer 2

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Chemistry

Some Basic Concepts of Chemistry

Atomic and Molecular Masses

P and Q are two elements wh...

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Asked on December 20, 2019 by

Mudra Chouhan

P and Q are two elements which form P

2

Q

3

and PQ

2

compounds. If 0.15 moles of P

2

Q

3

& PQ

2

weigh 15.9 g and 9.3 g respectively, then the atomic mass of 6Q is Y . Then Q is:

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ANSWER

Suppose atomic masses of P and Q are X and Y respectively.

Molar mass of P

2

Q

3

=2X+3Y

and Molar mass of PQ

2

=X+2Y

∴2X+3Y=

0.15

15.9

....(i) and X+2Y=

0.15

9.3

....(ii) (Moles = Weight/Molecular weight)

Solving these equations, X=26gmol

−1

,Y=18gmol

−1

So, the atomic mass of 6Q is 18.

Hence, Q=3.

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