What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(g)?
Correct Answer: Negative enthalpy change
- Step 1: Identify the reactants in the reaction, which are hydrogen gas (H2) and oxygen gas (O2).
- Step 2: Identify the product of the reaction, which is water in gas form (H2O).
- Step 3: Understand that the reaction combines hydrogen and oxygen to form water.
- Step 4: Recognize that this reaction releases energy, meaning it is exothermic.
- Step 5: Conclude that because the reaction releases energy, the enthalpy change (ΔH) is negative.
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