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Q.

What is the number of moles of O-atom in 126 amu of HNO₃ ?

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a

2

b

$\frac{2}{N_{A}}$

c

6

d

$\frac{6}{N_{A}}$

answer is D.

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Detailed Solution

126 amu HNO₃ = 2 molecules of HNO₃ = 6 atoms of O
Moles of O - atom = $\frac{6}{N_{A}}$

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