Avogadro’s number - Number of units in one mole of any substance is equal to 6.022140857 × 10^23. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.
1 mole = 6.022 × 10^23 molecules (Avogadro’s number)
In CH4 methane there are 4 hydrogen atom
So the number of molecules in 4 hydrogen atom = 4 X 6.022 x 10^23 molecules
= 24.088 X 10^23 molecules
= 2.409 X 10^24 molecules
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