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

Question

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 (A) 40000 (B) 2.7 × 1021 (C) 3.3 × 1024 (D) 5.4 × 1021

Tardigrade Admin · Accepted Answer

22.4 L or 22400 L contains =6.023 × 1023 molecules or 6.023 × 1023 atoms of He 100 cc or 100 mL will contain =(6.023 × 1023/22400) × 100 =2.7 × 1021 atoms

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

$40000$

$2.7 \times 1 0^{21}$

$3.3 \times 1 0^{24}$

$5.4 \times 1 0^{21}$

$22.4 L$ or $22400 L$ contains $= 6.023 \times 1 0^{23}$ molecules

or $6.023 \times 1 0^{23}$ atoms of $He$

$100 cc$ or $100 m L$ will contain $= \frac{6.023 \times 1 0 ^{23}}{22400} \times 100$

$= 2.7 \times 1 0^{21}$ atoms

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

40000

2.7×1021

3.3×1024

5.4×1021