Here we have 126 AMU of HNO3,
Molar mass of HNO3 is 1+14+16×3 = 63amu
Number of molecules of HNO3 are = 126/63 = 2
Here we have 2 molecules
Each molecule have 3 atoms of oxygen.
So no. of oxygen atoms= 3×2 =6 atoms
No. Of moles = given particles/ avogadro number
No. of moles of oxygen = 6 / 6.022 x 1023
No. of moles =9.96 x 1022
for complete explanation of mole concept click the link below:-
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