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Pertama, cari mol He (gunakan hukum avogadro)
mol He / mol N₂ = Volume He / Volume N₂
mol He / (5,6/28) = 10 liter / 5 liter
mol He / 0,2 = 2 liter
mol He = 0,4 mol
Jumlah atom He = mol x L
= 0,4 x 6,02x10²³
= 2,4 x 10²³