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ICSE Class 10 Chemistry 2017 Paper

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Question : 33 of 86
Marks: +1, -0
A compound of XX and YY has the empirical formula XY2\mathrm{XY}_2 . Its vapour density is equal to its empirical formula weight.
Determine its molecular formula.
Solution:  
    Given: V.D. = Empirical formula weight  \;\;\text{Given: V.D. = Empirical formula weight}\;
    Molecular mass  =2×  V.D.  \;\;\text{Molecular mass}\;=2 \times \;\text{V.D.}\;
  =2×  Empirical formula weight  \;=2 \times \;\text{Empirical formula weight}\;
  n=2×  Empirical formula mass    Empirical formula mass    \;n=\frac{2 \times \;\text{Empirical formula mass}\;}{\;\text{Empirical formula mass}\;}\;
  ∴    n=2  \; \therefore \;\; n=2\;
Molecular formula   =(Empirical formula)n  \;=(\text{Empirical formula})_n\;
∴    =(XY2)2  \therefore \;\; = (\mathrm{XY}_2)_2\;
  =X2Y4\;= \mathrm{X}_2 \mathrm{Y}_4
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