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MArishka [77]
3 years ago
9

Consider the reaction:

Chemistry
1 answer:
mestny [16]3 years ago
5 0

Answer:

ΔHrxn = [(1) x (-1675.7 kJ/mole) + (2) x (0 kJ/mole)] - [(1) x (-824.3 kJ/mole) + (2) x (0 kJ/mole)] = -1675.7 kJ/mole + 824.3 kJ/mole = -851.4 kJ/mole.

Explanation:

  • To calculate ΔH of the reaction, we use the mathematical relation:
  • ΔHrxn = ∑ΔHproducts - ∑ΔHreactants.
  • So, ΔHrxn = [(n x ΔHf for Al₂O₃) + (n x ΔHf for Fe)] - [(n x ΔHf for Fe₂O₃) + (n x ΔHf for Al)]
  • where n is the number of moles of each reactant.
  • ΔHrxn = [(1) x (-1675.7 kJ/mole) + (2) x (0 kJ/mole)] - [(1) x (-824.3 kJ/mole) + (2) x (0 kJ/mole)] = -1675.7 kJ/mole + 824.3 kJ/mole = -851.4 kJ/mole.
  • <em>ΔHf for Al and Fe = 0.0 kJ/mole</em>; since the heat for formation of elements that found in nature is equal 0.0 kJ/mole
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Answer:

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Answer:

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SO_4^{2-}(aq)+Sn^{2+}(aq)\rightarrow H_2SO_3(aq)+Sn^{4+}(aq)

Balancing in acidic medium:

First we will determine the oxidation and reduction reaction from the givne reaction :

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Balance O by adding water on required side:

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Now, balance H by adding H^+ on the required side:

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