Two elements P and Q form P2O3 and PQ2. If 0.15 mole of P2Q3 weigh 15.9g and 0.5 mole of PQ2 weigh 9.3 g. Find atomic mass of P and Q.

Asked by Prince Sonu | 18th Apr, 2013, 09:32: PM

Expert Answer:

Lets assume the atomic masses of P and Q are x and y respectively.
 
Mw of P2Q3 = 2 x + 3 y 
MW of PQ2 = x + 2 y
 
we know moles = weight/ mw
 
so, 2x + 3y = 15.9/ 0.15 
x + 2y = 9.3/ 0.15
 
Solving these equations, you will get x= 26, y =18 

Answered by  | 19th Apr, 2013, 09:22: PM

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