How many molecules of dioxygen are associated with a #3.2*g# mass of this gas?

1 Answer
anor277
Jun 8, 2017

We use the molar quantity..........and get approx. #1xx10^24# molecules of #O_2#.

Explanation:

We know that #"Avogadro's Number"#, #N_A-=6.022xx10^23*mol#.

And so to find the number of oxygen MOLECULES, we divide the mass by the molar mass, and multiply by #"Avogadro's Number"#.

#"Number of oxygen molecules.........."#

#=((0.0032*kg)/(0.018*kg*mol^-1))xx6.022xx10^23*"molecules"*mol^-1=??"molecules"#

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