Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the standard enthalpy of formation for an element in its most stable form?
💡 Hint: Think of a stable compound like carbon in graphite form.
Question 2
Easy
What does ΔH_f° represent?
💡 Hint: It’s a formation reaction.
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Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the standard enthalpy of formation for elements in their most stable form?
- 0 kJ mol⁻¹
- -393.5 kJ mol⁻¹
- 20 kJ mol⁻¹
💡 Hint: It’s a benchmark value.
Question 2
Are exothermic reactions characterized by a positive or negative ΔH?
- True (they are negative)
- False (they are positive)
💡 Hint: Think about heat flow!
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Challenge Problems
Push your limits with challenges.
Question 1
The standard enthalpy of formation for H₂O(l) is -285.8 kJ/mol. Calculate the enthalpy for the reaction 2H₂(g) + O₂(g) → 2H₂O(l).
💡 Hint: Use stoichiometric coefficients for the formation.
Question 2
Given that the ΔH_f° for C(graphite) is 0 kJ/mol and for O₂ is also 0 kJ/mol, if ΔH_f° for CO₂ is -393.5 kJ/mol, determine the enthalpy change for a reaction producing CO₂ from its elements.
💡 Hint: Recap what ΔH_f° stands for in terms of formation from elements.
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