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Numericals involving moles, molecules and atoms

Five moles of electrons are present in----- grams of methane


Each carbon atom, C612 contains….6 protons, 6 electrons and 6 neutrons ;

Each hydrogen atom, H11 contains….1 proton, 1 electron and zero neutrons ;

Thus each molecule of CH4 contains…10 protons, 10 electrons and 6 neutrons ;

Thus each mole (16 g) of CH4  contains…10 moles (10 NA) of protons, 10 moles (10 NA)  of electrons and 6 moles (6 NA)  of neutrons ;

5×1610= 8 gm

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