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
1 answer:
Answer is: <span>the standard enthalpy of reaction is</span> -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).<span>
ΔHrxn - enthalpy change of chemical reaction. <span>ΔHf - enthalpy of formation of reactants or
products. </span></span>ΔHrxn = (2 · (-285,8) + 2 · (-296,8)) - (2 · (-20,5)) · kJ/mol. ΔHrxn = -1124,2 kJ/mol.
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