ICSE Class 10 Chemistry 2014 Solved Paper

Question : 33

Total: 88

A compound made up of two elements X and Y has an empirical formula X2 Y. If the atomic weight of X is 10 and that of Y is 5 and the compound has a vapour density 25 , find its molecular formula.

Solution:

Emp. formula =X2Y , At. wt. of X= 10, At. wt. of Y=5
∴ Empirical formula mass
=2×10+5=25
vapour density V.D. =25
‌ Mol. Mass ‌‌=‌ V.D. ‌×2=25×2
‌=50
n‌=‌

‌ Mol. Mass ‌

‌ Emp. formula mass ‌

‌=‌

=2
‌ Mol. formula ‌‌=‌ Emp. formula ‌×2
‌=X2Y×2
‌=X4Y2.

Go to Question:

Prev Question

Next Question