Final answer:
The energy change for the reaction of 3.05 g of H₂S with excess O₂ cannot be calculated without the specific enthalpy change for this reaction, which is not provided.
Step-by-step explanation:
The question at hand involves a chemical reaction where hydrogen sulfide gas (H₂S) reacts with excess oxygen (O₂) to form sulfur dioxide (SO₂) and water vapor (H₂O), and we're asked to determine the energy change when 3.05 g of H₂S react. To solve this, we would typically need the enthalpy change per mole for the reaction or some other data describing the energy aspects of this specific reaction.
The information provided includes various reactions and an enthalpy change for a different reaction involving sulfur dioxide and oxygen. However, it doesn't directly give us the energy change for the reaction in question. To answer accurately, we'd need the enthalpy change for the specific reaction of H₂S with O₂ or an analogous value from which we could calculate it. Without this information, the energy change for the reacting 3.05 g of H₂S cannot be calculated.