Question

a gas accupies a volume of 67.2 dm3 at stp how many number of moles are there?​

Answer 1

By Avogadro law,

22.4 liter of any gas at STP=1mole

=6.022×10

23

molecules of gas

=NA (Avogadro number)

So, we need to find moles in 67.2 L of gas

1 L of gas = Avogadros no. /24 .4

in 67.2 L = 67.2/24.4 × Na

= almost 3 Na

here Na is avogadros number.