Determine the number of atoms of O in 22.3 moles of Al₂(CO₃)₃.
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The chemical formula for aluminum carbonate, Al₂(CO₃)₃ , indicates that in one mole of the compound there are nine moles of oxygen atoms.
Calculate the moles of O atoms in 22.3 moles of Al₂(CO₃)₃.
22.3 mol Al₂(CO₃)₃ × 9 mol O atoms/1 mol Al₂(CO₃)₃ = 200.7 mol O atoms
Calculate the number of O atoms in 200.7 moles.
1 mole of atoms = 6.022 × 10²³ atoms
200.7 mol O atoms × 6.022 × 10²³ O atoms/1 mol O atoms = 1.21 × 10²⁶ O atoms to three significant figures
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