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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define Hess's Law.
💡 Hint: Think about how the overall energy change is concerned with initial and final states.
Question 2
Easy
Explain the significance of Hess’s Law in thermochemistry.
💡 Hint: Consider how we can break down complex reactions into simpler parts.
Practice 1 more question and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does Hess's Law state?
- The overall energy change is affected by the pathway.
- Total enthalpy change is the same regardless of steps.
- Enthalpy cannot be measured directly.
💡 Hint: Focus on how the reaction can occur in different manners.
Question 2
True or False: Hess’s Law allows us to calculate unknown enthalpy changes.
- True
- False
💡 Hint: Consider how complex reactions can be approached.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Given the standard enthalpy of formation values for N₂(g)=0, O₂(g)=0, and ΔH_f°[NO(g)] = 90.3 kJ/mol, calculate ΔH for the reaction: N₂(g) + O₂(g) → 2NO(g).
💡 Hint: Remember that formation enthalpy values for elements in their standards states are zero.
Question 2
Using Hess's Law, if the enthalpy change for the combustion of propane (C3H8) is -2043 kJ/mol, derive the enthalpy change for the formation of propane.
💡 Hint: Think about how reversing a reaction changes the sign of ΔH.
Challenge and get performance evaluation