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Molecules and Atomicity

How many mole...

Question

How many molecules are present in 80L of $C O_{2}$ gas at STP?

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Solution

Number of moles of gas = $\frac{V (i n l i t e r s)}{22.4}$
= $\frac{80}{22.4}$
= $3.57 m o l e s$
No. of molecules = $m o l e s \times 6.023 \times 10^{23}$
= $3.57 \times 6.023$ $\times$ $10^{23}$
= $21.5 \times 10^{23}$ molecules

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