According to the definition of mole: 1 mole ofsubstance consists of 6.022×1023 elementary entities of thatsubstance; 1mole = 6.022×1023 it means that in 2moles of He will be x elementary entities of that substance (atoms) of He. From this proportion x = 2×6.022×1023/1= 12.044×1023 ≈ 1.2×1024 atoms of He.
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