Question

How many particles are present in 8g of oxygen molecules

Answer 1

molar mass of oxygen gas = 32g
no. of moles in 8g = 8/32 = 0.25 moles

no. of particles(molecules) = 0.25 * 6.02 * 10^23 = 1.5 * 10^23 

Answer 2

Hi ☺️☺️

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Molar mass of oxygen = 32 g.

So

32 g of oxygen = 1 mole.

1 g of oxygen = 1 / 32 mole

8 g of oxygen = 1 / 32 × 8

⇒ 1/ 4 moles

No of particles = 1 / 4 × 6.02 × 10²³

⇒ 1.5 × 10²³

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Thanks !

@AarohiG ❤️