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Mole Concept and Avogadro's Number

X and Y are t...

Question

X and Y are two elements which form X₂Y₃and XY₂ molecules. If 0.15 mole of X₂Y₃ and XY₂ weighs 15.9 g and 9.3 g respectively. What are the atomic mass of X and Y.

A

X and Y are 18 and 26 respectively

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B

X and Y are 22 and 26 respectively

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C

X and Y are 22 and 18 respectively

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D

X and Y are 26 and 18 respectively

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Solution

The correct option is D
X and Y are 26 and 18 respectively

Let at mass of X and Y be a and b respectively

Therefore, Molecular mass of X₂Y₃ = 2a + 3b

And Molecular mass of XY₂ = a + 2b

Therefore, (2a + 3b) x 0.15 = 15.9

And (a + 2b) x 0.15 = 9.3

So, a and b is equal to 26 and 18 i.e atomic mass of X and Y are 26 and 18 respectively.

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