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What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(g)?
What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(g)?
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Practice Questions
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Q1
What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(g)?
It is positive.
It is negative.
It is zero.
It is dependent on temperature.
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The formation of water from hydrogen and oxygen is an exothermic reaction, thus the enthalpy change is negative.
Questions & Step-by-step Solutions
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Q
Q: What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(g)?
Solution:
The formation of water from hydrogen and oxygen is an exothermic reaction, thus the enthalpy change is negative.
Steps: 5
Show Steps
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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