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Mole Concept

Calculate the...

Question

Calculate the number of moles in
(i) $8 g$ of oxygen atoms
(ii) $4.088 \times 10^{21}$ number of oxygen atoms (Atomic mass of $O = 16 u$ )

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Solution

i) No. of moles in $8 g$ of oxygen atom
$n = \frac{m}{M} \times N_{A} \Rightarrow \frac{8}{16} \times 6.02 \times 10^{23}$
$= 3.01 \times 10^{23}$ moles
ii) $6.02 \times 10^{23}$ atoms contains $1$ mole
Then, $4.088 \times 10^{21}$ atom contains $= \frac{4.088 \times 10^{21}}{6.02 \times 10^{23}} = 0.67 \times 10^{- 2}$ moles.

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