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

Question

1320 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-06-08T09:19:01

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

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 $"Avogadro's Number"$ .

$"Number of oxygen molecules.........."$

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

How many molecules of dioxygen are associated with a 3.2*g3.2*g mass of this gas?