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What does Hess's law state about enthalpy changes?

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Question: What does Hess\'s law state about enthalpy changes?

Options:

  1. Enthalpy changes are independent of the path taken.
  2. Enthalpy changes depend on the temperature.
  3. Enthalpy changes are always positive.
  4. Enthalpy changes can be calculated using average bond energies.

Correct Answer: Enthalpy changes are independent of the path taken.

Solution: 

Hess\'s law states that the total enthalpy change for a reaction is the same, regardless of the number of steps taken, making it path-independent.

What does Hess's law state about enthalpy changes?

Practice Questions

Q1
What does Hess's law state about enthalpy changes?
  1. Enthalpy changes are independent of the path taken.
  2. Enthalpy changes depend on the temperature.
  3. Enthalpy changes are always positive.
  4. Enthalpy changes can be calculated using average bond energies.

Questions & Step-by-Step Solutions

What does Hess's law state about enthalpy changes?
  • Step 1: Understand that enthalpy is a measure of energy in a chemical reaction.
  • Step 2: Know that a chemical reaction can happen in one step or multiple steps.
  • Step 3: Realize that Hess's law says the total energy change (enthalpy change) is the same no matter how many steps the reaction takes.
  • Step 4: Remember that this means the energy change does not depend on the path taken to get from reactants to products.
  • Hess's Law – Hess's law states that the total enthalpy change for a reaction is the same, regardless of the number of steps taken, making it path-independent.
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