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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the standard enthalpy of formation for elements in their standard state?
💡 Hint: Remember the definition of standard enthalpy of formation.
Question 2
Easy
Write the reaction equation for the formation of water.
💡 Hint: Think of what elements combine to form water.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the enthalpy of formation of elements in their standard state?
- 0 kJ/mol
- 100 kJ/mol
- Negative value
💡 Hint: Think about the baseline for enthalpy.
Question 2
Is the enthalpy of formation for water negative or positive?
- True
- False
💡 Hint: Recall what happens during process energy release.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Acetylene (C₂H₂) undergoes combustion to form CO₂ and H₂O. Given ΔH_f° is -1,203 kJ/mol for C₂H₂, -393.5 kJ/mol for CO₂, and -285.8 kJ/mol for H₂O, calculate the ΔH for the combustion reaction.
💡 Hint: Balance the reaction before plugging in enthalpy values.
Question 2
Use Hess's law to find ΔH for the reaction 2NH₃(g) + 3O₂(g) → N₂(g) + 3H₂O(l). Given provided formation values, calculate and show steps.
💡 Hint: Break it down into multiple known reactions to build it out stepwise.
Challenge and get performance evaluation