What is the enthalpy change for the reaction: H2(g) + 1/2 O2(g) → H2O(l)?

What is the enthalpy change for the reaction: H2(g) + 1/2 O2(g) → H2O(l)?

Step 1: Identify the reaction. We have hydrogen gas (H2) and oxygen gas (O2) reacting to form liquid water (H2O).
Step 2: Understand what enthalpy change means. It is the heat energy change during a chemical reaction at constant pressure.
Step 3: Look for the standard enthalpy change value for the formation of water. This value is usually found in tables of thermodynamic data.
Step 4: Find the standard enthalpy change for the reaction H2(g) + 1/2 O2(g) → H2O(l). This value is -241.8 kJ/mol.
Step 5: Interpret the value. The negative sign indicates that the reaction releases energy (exothermic reaction).

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