Iron can be produced from iron(III) oxide - Scottish Highers Chemistry - Question 17 - 2019
Question 17
Iron can be produced from iron(III) oxide.
2Fe2O3(s) + 3C(s) → 4Fe(s) + 3CO(g)
The GFM values are:
- For 2Fe2O3: 159.6 g
- For 3C: 12.0 g
- For 4Fe: 55.8 g
- For 3... show full transcript
Worked Solution & Example Answer:Iron can be produced from iron(III) oxide - Scottish Highers Chemistry - Question 17 - 2019
Step 1
Calculate the total GFM of reactants
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Answer
The total GFM of the reactants is the sum of the GFM of iron(III) oxide and carbon:
GFMreactants=2(159.6extg)+3(12.0extg)
Calculating this, we have:
GFMreactants=319.2extg+36.0extg=355.2extg
Step 2
Calculate the total GFM of products
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Answer
The total GFM of the products is the sum of the GFM of iron and carbon monoxide:
GFMproducts=4(55.8extg)+3(44.0extg)
Calculating this, we have:
GFMproducts=223.2extg+132.0extg=355.2extg
Step 3
Calculate the atom economy
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Answer
Finally, the atom economy can be calculated using:
Atom ext{ }Economy = rac{GFM_{products}}{GFM_{reactants}} imes 100
Substituting the values:
Atom ext{ }Economy = rac{355.2 ext{ g}}{355.2 ext{ g}} imes 100 = 100 ext{ }\text{ ext{ — this calculation was incorrect. Let’s review our focuses}}
In fact: products GFM: 223.2 g (iron only)
So:
= 62.8 ext{ ext{%}}$$
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