What is the number of moles of O-atom in 126 amu of `HNO_(3)` ?

What is the number of moles of O-atom in 126 amu of `HNO_(3)` ?
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What is the number of moles of O-atom in 126 amu of `HNO_(3)` ? A. 2 B. `(2)/(N_(A))` C. 6 D. `(6)/(N_(A))`
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