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Use the ΔHrxn values of the following reactions: 2 SO2 (g) + O2 (g) → 2...

Use the ΔHrxn values of the following reactions:

2 SO2 (g) + O2 (g) → 2 SO3 (g) ΔHrxn = -196 kJ

1/4 S8 (s) + 3 O2 (g) → 2 SO3 (g) ΔHrxn = -790 kJ

to calculate the ΔHrxn value of this reaction:

1/8 S8 (s) + O2 (g) → SO2 (g)

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Answer #1

given reactions are

2 SO2 (g) + O2 (g) → 2 SO3 (g) ΔHrxn = -196 kJ    (1)

1/4 S8 (s) + 3 O2 (g) → 2 SO3 (g) ΔHrxn = -790 kJ   (2)

to calculate the ΔHrxn value of this reaction: 1/8 S8 (s) + O2 (g) → SO2 (g)   (3)

Eq.2- Eq.1 gives

1/4S8+3O2-2SO2-O2--à0   ΔHrxn=-790+196=-594 Kj    (4)

1/4S8+ 2O2--à 2SO3 ΔHrxn=-594 Kj    (5)

Dividing Eq.5 by 2 gives 1/8S8+ O2--à SO3 ΔHrxn=-594/2=-297 Kj

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