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28 July, 10:51

How many atoms are in 5 grams of Fe2O3? (ITS NOT 5)

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  1. 28 July, 12:57
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    There are two iron atoms and three oxygen atoms in each molecule of Fe2O3. So that's five atoms per molecule. One mole of any molecular substance contains 6.02*1023 molecules. Since there are two iron atoms in each of the molecules we're considering, there will be (6.02*1023) ⋅2=1.204*1024 iron atoms in a whole mole of them. But we're considering 0.550 mol, so multiply by 0.550:n = (0.550 mol) ⋅ (3.01*1024 atoms/mol) = 6.62*1023 iron atoms.
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