How many molecules are in 4.5 L of CO_2 at STP?

1 Answer
May 1, 2016

(4.5*L)/(22.4*L*mol^-1) xx N_A, where N_A =" Avogadro's number"

Explanation:

We assume ideality, and recall that at "STP" 1 mole of ideal gas occupies a volume of 22.4*L. We also know that N_A =" Avogadro's number" = 6.02214xx10^23*mol^-1

So (4.5*L)/(22.4*L*mol^-1) xx 6.02214xx10^23*mol^-1 =

"approx. "1/5xxN_A?

You can do the arithmetic.

How many atoms are there in this quantity?