HQ5.49 Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction: 2 H 2 S (g) + 3 O 2 (g) → 2 H 2 O (l) + 2 SO 2 (g) ΔH ∘ rxn

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Chemistry

Jaylin Bean

9 December, 00:43

HQ5.49 Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction: 2 H 2 S (g) + 3 O 2 (g) → 2 H 2 O (l) + 2 SO 2 (g) ΔH ∘ rxn

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Melody Mcconnell · Answer 1

Answer is: the standard enthalpy of reaction is - 1124,2 kJ/mol.

ΔHf (H₂S) = - 20.5 kJ/mol

ΔHf (O₂) = 0 kJ/mol.

ΔHf (H₂O) = - 285.8 kJ/mol.

ΔHf (SO₂) = - 296.8 kJ/mol.

ΔHrxn = ∑ΔHf (products of reaction) - ∑ΔHf (reactants).

ΔHrxn - enthalpy change of chemical reaction.

ΔHf - enthalpy of formation of reactants or products.

ΔHrxn = (2 · (-285,8) + 2 · (-296,8)) - (2 · (-20,5)) · kJ/mol.

ΔHrxn = - 1124,2 kJ/mol.