Suppose two elements X and Y combine to form two compounds XY₂ and X₂Y₃ when 0.05 mole of XY₂ weighs 5 g while 3.011 x 10²³ molecules of X₂Y₃. weighs 85 g. The atomic masses of X and f are respectively :

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20,30

30,40

40,30

80,60

answer is C.

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Detailed Solution

Mot. wt. of ${XY}_{2} = \frac{5}{0 .05} = 100$
Mol. wt. of $X_{2} Y_{3} = \frac{85}{3 .011 \times 10^{23}} \times N_{A} = 170$
Let molar mass of x and Y are a and b respectively
$∴$ a + 2b = 100
2a +3b =170
a=40.
b=30

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