1.4.4 - Enthalpy of Reaction (ΔH_rxn°)
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Practice Questions
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What does a negative ΔH_rxn° indicate?
💡 Hint: Think about whether heat is being released or absorbed.
What is ΔH_f°?
💡 Hint: Remember it involves the formation of one mole from elements.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does a positive value of ΔH_rxn° indicate?
💡 Hint: Consider if the reaction is taking in energy.
Is Hess's Law applicable for reactions involving multiple steps?
💡 Hint: Recall if the overall change remains constant.
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Challenge Problems
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Using Hess's Law, derive the enthalpy change for the combustion of ethane using the known enthalpy values of related reactions.
💡 Hint: Remember to reverse or scale reactions for accurate summation.
Given ΔH_f° for potassium chloride (KCl), calculate the ΔH for dissolving it in water by linking it to its formation reactions.
💡 Hint: Consider the energy change when going from solid to ions in solution.
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