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Question

Two elements X and Y have atomic mass 75 and 16 respectively. They combine to give a compound having 75.8% X. The empirical formula of the compound is:

A
XY
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B
X2Y
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C
X2Y2
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D
X2Y3
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Solution

The correct option is D X2Y3
Let the total mass of the compound be 100 g
Then, mass of X would be 75.8 g
Mass of Y would be 24.2 g
Now, moles of X=75.8751
moles of Y=24.2161.5
Hence the required empirical formula = XY1.5=X2Y3

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