Methane (ch4) is a greenhouse gas. how many hydrogen atoms are in 1.4 moles of methane?

The answer is:

There are 3.6 X 10^24 hydrogen atoms.

The explanation:

1.4 moles of methane will contain 1.4*Avogadro's number

                                       = 1.4*(6.02 X 10^23) =  8.4 X 10^23 methane molecules. But, since the formula for methane is CH4, there are 4 hydrogen atoms for each methane molecule. Thus, 1.4 moles of methane contain

4*(8.4 X 10^23) = 3.6 X 10^24 hydrogen atoms.

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