How many molecules are in 33.6 liters of neon (Ne) gas at STP?

Answer 1

I think you mean moles. In this case, at STP, a mole of a gas is 22.4 L. Thus, we would divide 33.6/22.4 to get 1.5 moles of gas.

Answer 2

As pointed out by @Siddharth B., you probably meant how many moles, or perhaps, how many atoms. But you cannot have a molecule of Ne. So, here is the answer if you meant number of atoms.

At STP 1 mole of an ideal gas occupies 22.4L.

33.6 L x 1 mol/22.4 L = 1.5 moles of Neon

1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms