The number of atoms that are present in 4Al₂O₃ is 24×10²³atoms.
Avogadro's number is the number of entities that are present in one mole of any substance, i.e.
1 mole = 6.022 × 10²³ atoms
Coefficient present in the given compounds gives idea about the moles of that substance. In 4Al₂O₃ number of moles of Al₂O₃ is 4.
Number of atoms of Al₂O₃ in 4 mole = 4mol × 6.022 × 10²³atoms/mol = 24×10²³atoms
Hence number of atoms of Al₂O₃ in 4 moles of 4Al₂O₃ is 24×10²³atoms.
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