What is the number of moles of \( \mathrm{O} \)-atom in \( 126 \mat...

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What is the number of moles of \( \mathrm{O} \)-atom in \( 126 \mathrm{amu} \)
\( \mathrm{P} \) of \( \mathrm{HNO}_{3} \) ?

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(A) 2
(B) \( \frac{2}{\mathrm{~N}_{\mathrm{A}}} \)
(C) 6
(D) \( \frac{6}{\mathrm{~N}_{\mathrm{A}}} \)
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