ICSE Class 10 Chemistry 2016 Solved Paper

A gas cylinder contains 12×1024 molecules of oxygen gas.
If Avogadro's number is 6×1023; Calculate :

Question : 60

Total: 85

the mass of oxygen present in the cylinder.

Solution:

Let Mass of molecule
=‌

‌ No. of Molecules ‌

×‌ Molecular Mass ‌
=‌‌

12×1224

6×1023

×(2×16)
‌=2×10×32=640g

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