S + 2 3 O 2 ⟶ SO 3 + 2 x kcal ; SO 2 + 2 1 O 2 ⟶ SO 3 + y kcal The heat of formation of SO 2 is

For the formation of SO₂ S + O₂ ⟶SO₂ …(3) The above reaction can be obtained S + 2 3 O₂ ⟶ SO₃ …(1) Δ H = − 2 x SO₂ + 2 1 O₂ ⟶ SO₃ …(2) Δ H = − y Subtracting equation (2) from (1) S + O₂ ⎯→ SO₂, Δ H = y − 2 x

Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of FormationMedium2 minQB

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$S + \frac{3}{2} O_{2} ⟶ SO_{3} + 2 x kcal$ ;

$SO_{2} + \frac{1}{2} O_{2} ⟶ SO_{3} + y kcal$

The heat of formation of SO₂ is

Options:

Answer:

Solution:

For the formation of SO₂

S + O₂ ⟶SO₂ …(3)

The above reaction can be obtained

S + $\frac{3}{2}$ O₂ ⟶ SO₃ …(1) $Δ H = - 2 x$

SO₂ + $\frac{1}{2}$ O₂ ⟶ SO₃ …(2) $Δ H = - y$

Subtracting equation (2) from (1)

S + O₂ ⎯→ SO₂, $Δ H = y - 2 x$

Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Formation

⏱ 2mℹ️ Source: QB

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