ICSE Class 10 Chemistry 2015 Solved Paper

Complete the following calculations. Show working for complete credit :

Question : 13

Total: 85

If the empirical formula of a compound is CH and it has a vapour density of 13, find the molecular formula of the compound.

Solution:

‌ Molecular formula ‌‌=CH
‌ V.D. ‌‌=13
‌ Mol. Mass ‌‌=2×‌ V.D. ‌
‌=2×13=26
Empirical formula weight of CH
‌=12+1=13
n‌=‌

‌ Mol. Mass ‌

‌ Emp. formula Mass ‌

‌=‌

=2
Molecular formula =(Emp.‌ formula ‌)n
=(CH)2=C2H2

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