Question

How many oxygen molecules are in 3.36 g of oxygen?

Answer 1

`6.321` x `10^22`

Explanation:

Solution:

Mass of Oxygen = `3.36g`
Molar mass of oxygen (`O_2`) = 16 x 2 = `32gmol^-`
Total molecules in oxygen = Mass in grams/Molar mass x `N_A`
= `3.36/32` x`6.02` x `10^23`
= `6.321` x`10^22`

Note:
`N_A`(Avagadro's number) = `6.02` x `10^23`

Hope it helps...