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Let us get number atoms of the constituent first.
4 grams CH4 (1 mole CH4/16.042 grams)(6.022 X 1023/1 mole CH4)
= 1.5 X 1023 atoms of methane
========================so,
Carbon is one to one in the molecular formula, so let's get the number of hydrogen atoms in this mass methane.
1.5 X 1023 atoms CH4 (4 mole H/1 mole CH4)
= 6 X 1023 atoms hydrogen
======================now, we proceed to find electrons
1.5 X 1023 atoms carbon * 6 electrons
= 9 X 1023 electrons carbon
--------------------------------------
6 X 1023 atoms hydrogen * 1 electron
= 6 X 1023 electrons hydrogen
--------------------------------------------added together
= 1.5 X 1024 electrons in 4 grams methane
-------------------------------------------------------------( call it 2 X 1024 electrons methane to be in line with significant figures )
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