) The standard enthalpies of formation of SO2 and SO3 are ?297 and ?396 kJ/mol respectively....

) The standard enthalpies of formation of SO2 and SO3 are ?297 and ?396 kJ/mol respectively. Calculate the standard enthalpy of reaction for the reaction: SO2(g) + 1/2O2(g)??SO3 (g)

Expert Solution

The reactions showing formation of SO2 & SO3 are as follows :

S (s) + O₂ (g) SO₂ (g) : ₁ = -297 KJ/mol ----------------- (1)

S (s) + (3/2) O₂ (g) SO₃ (g) : ₂ = -396 KJ/mol ------------------ (2)

Given reaction is SO₂(g) + (1/2) O₂(g) SO₃ (g) : = ? --------- (3)

Eqn (3) is obtained from first two equations as follows:

Eqn(3) = reverse of Eqn(1) + Eqn (2)

So = - ₁ + ₂

= -(-297 KJ/mol ) + (-396 KJ/mol)

= -99 KJ/mol

Therefore the standard enthalpy of reaction is -99 KJ/mol

queen_honey_blossom answered 3 hours ago

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