2.2.3 - Using Hess’s Law with Multiple Steps
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Practice Questions
Test your understanding with targeted questions
What does Hess's Law state?
💡 Hint: Think of it in terms of total energy changes.
Can we measure ΔH for a reaction directly?
💡 Hint: Consider how we can apply known values in calculating other reactions.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does Hess's Law allow us to do?
💡 Hint: Think about how we can use known values to derive new properties.
True or False: Hess's Law states that the path taken in a chemical reaction affects the total energy change.
💡 Hint: Consider the main idea behind Hess's Law.
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Challenge Problems
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Using Hess’s Law, calculate the enthalpy change for the following target reaction: N₂(g) + 3H₂(g) → 2NH₃(g) from known ΔH values. Use the formation enthalpy of NH₃ and others as necessary.
💡 Hint: Make sure to balance and reverse reactions as needed for the final calculations.
How would you determine ΔH for the reaction 2 CO(g) + O₂(g) → 2 CO₂(g) using formation enthalpies? Write out the equations and the steps you take.
💡 Hint: Ensure you understand how to balance and apply known values to formulate your solution.
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