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  4. An electric bulb was filled with 100 cc of argon gas (At. mass = 40 ) at STP. The number of atoms of argon present in the bulb is

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Q. An electric bulb was filled with $100 \,cc$ of argon gas (At. mass = 40 ) at STP. The number of atoms of argon present in the bulb is

Some Basic Concepts of Chemistry

Solution:

$22.4 \,L$ or $22400 \,L$ contains $=6.023 \times 10^{23}$ molecules

or $6.023 \times 10^{23}$ atoms of $He$

$ 100 \,cc$ or $100 \,mL$ will contain $=\frac{6.023 \times 10^{23}}{22400} \times 100$

$=2.7 \times 10^{21}$ atoms