Question

calculate the number of O2 molecules present in 8 gram of O2 molecules

Answer 1

no. of moles of O2= 8/32
. =1/4
. =0.25
so no. of O2 molecules= 0.25xAvagadro number
. = 0.25x6.02x10^23
. =1.505X10^23
.

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

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Thanks !

@AarohiG ❤️