What is the standard enthalpy change for the formation of water from hydrogen an

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Question: What is the standard enthalpy change for the formation of water from hydrogen and oxygen?

Options:

Correct Answer: -285.8 kJ/mol

Solution:

The standard enthalpy change for the formation of water (H2 + 0.5 O2 -> H2O) is -285.8 kJ/mol.

What is the standard enthalpy change for the formation of water from hydrogen and oxygen?

What is the standard enthalpy change for the formation of water from hydrogen and oxygen?

Step 1: Understand that the question is asking for the energy change when hydrogen and oxygen combine to form water.
Step 2: Write the chemical equation for the reaction: H2 + 0.5 O2 -> H2O.
Step 3: Recognize that the standard enthalpy change is a measure of the heat energy released or absorbed during the reaction.
Step 4: Look up the standard enthalpy change for the formation of water, which is a known value.
Step 5: Find that the standard enthalpy change for this reaction is -285.8 kJ/mol, indicating that energy is released.

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