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Question

What is the no. Of moles of O atom in 126 amu of HNO​​​​3.


Solution

The molar mass of HNO​3 is 63amu.
Therefore ,the total number of molecules present is 126/63 = 2.
Since , One molecule of HNO3 has 3 atoms of O.
Hence , It will have 3×2 = 6 oxygen atom .

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