ICSE Class 10 Chemistry 2017 Solved Paper

Question : 33

Total: 86

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.

Solution:

‌‌ Given :V.D.= Empirical formula weight ‌
‌‌ Molecular mass ‌=2×‌ V.D. ‌
‌=2×‌ Empirical formula weight ‌
‌n=‌

2×‌ Empirical formula mass ‌

‌ Empirical formula mass ‌

‌∴‌‌n=2
Molecular formula ‌=(‌ Empirical formula ‌)n
∴‌‌=(XY2)2
‌=X2Y4

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