Which of the following contains Avagadro number of atoms?

Options

A. one mole of Helium gas
B. 22.4 Its of `CO_(2)` at STP
C. 11.2 Its of Hydrogen gas at STP
D. 3.2 gms of methane

Answer

A, C, D

Explanation

One mole of helium (mono atomic) contains Avogadro number of atoms
22.4 litres of `CO_(2)` at STP contains Avogadro number of molecules
`(11.2)/(22.4)xx6.023xx10^(23)xx2` atom of hydrogen
`(3.2)/(16)xx6.023xx10^(23)xx5` atoms