Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define Hess's Law in your own words.
💡 Hint: Think about how energy changes with different processes.
Question 2
Easy
What is ΔH_f°?
💡 Hint: Focus on the conditions and what’s being formed.
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Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does Hess's Law state?
- Total enthalpy is path-independent
- Total enthalpy is path-dependent
- Only exothermic reactions follow Hess's Law
💡 Hint: Consider the meaning of state functions.
Question 2
True or False: The standard enthalpy of formation for an element is always zero.
- True
- False
💡 Hint: Think about the elements in their natural forms.
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Challenge Problems
Push your limits with challenges.
Question 1
Given the reactions: 2H₂ + O₂ → 2H₂O (ΔH = -572 kJ) and 2H₂O → 2H₂ + O₂ (ΔH = +572 kJ), confirm Hess's Law by deriving ΔH for the complete cycle.
💡 Hint: Is the reverse of a reaction equal to its original enthalpy change?
Question 2
Calculate the ΔH for the following reaction using the provided reactions: N₂ + 3H₂ → 2NH₃. Given: ΔH (N₂ + 3H₂ → 2NH₃) = -92.4 kJ and ΔH (2NH₃ → N₂ + 3H₂) = +92.4 kJ.
💡 Hint: What does this imply about the state function of enthalpy?
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