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Question

A compound of X and Y has the empirical formula XY2. Its vapour density is equal to its empirical formula weight. Determine its molecular formula.


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Solution

Step 1: Given data:

Vapour density = empirical formula weight

Empirical formula of X and Y is XY2

Step 2: Finding the molecular weight:

Since,

molecularweight=2×vapourdensitymolecularweight=2×empiricalformulaweight(Vapourdensity=empiricalformulaweight)

Step 3: Finding the value of n:-

Since,

molecularweight=n×empiricalformulaweight2×empiricalformulaweight=n×empiricalformulaweightn=2 (fromstep1)

Step 4: Finding the molecular formula:-

The molecular formula of the compound is =(Empiricalformula)n=(XY2)2=X2Y4

Therefore, the molecular weight of the compound is X2Y4


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