Which tube has the greater number of moles?

Question

I collected hyrdogen gas in one tube and an equal volume of carbon dioxide gas in the same type of tube at the same pressure and temperature. Which tube has the greater number of moles? Could you also tell me which one has the greater number of molecules and atoms?
Thanks.
Please help.

Answer 1

They've both got the same number of molecules and moles. This is Avogadro's Law.

The CO2 one has the greater number of actual atoms, because CO2 has 3 atoms per molecule, and H2 has only 2.