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25/09/2021 5:32 pm
Topic starter
The ‘thermite reaction’ involving the reaction between ferric oxide and metallic aluminium produces molten iron. Given that
2Al + 3/2O2 → Al2O3; ΔH1 = -400 kcal/mol.
2Fe + 3/2O2 → Fe2O3; ΔH2 = -200 kcal/mol.
What is ΔH for the formation of 1 mole of iron?
(a) -100 kcal
(b) -200 kcal
(c) +100 kcal
(d) +200 kcal
1 Answer
1
25/09/2021 5:35 pm
Correct answer: (a) -100 kcal
Explanation:
I – II, gives, 2Al + Fe2O3 → 2Fe + Al2O3
we have -400 - (-200) = -200,
For one mole of iron the value is -100 cal