Find the number of moles of $H N O_{3}$ in a sample containing $10^{8}$ molecules of $H N O_{3}$ .

1.66 \times 10^{- 16}

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10^{8}

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1.66 \times 10^{16}

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6.022 \times 10^{15}

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Solution

The correct option is A $1.66 \times 10^{- 16}$
$N u m b e r o f m o l e s = \frac{N u m b e r o f m o l e c u l e s}{A v o g a d r o n u m b e r}$
$= \frac{10^{8} m o l e c u l e s}{6.022 \times 10^{23} m o l e c u l e s / m o l}$
$= 1.66 \times 10^{- 16}$

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