4.1 - Problem 1: Enthalpy of Reaction via Formation Values
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Practice Questions
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What is enthalpy?
💡 Hint: Think about heat flow and energy.
Define exothermic reaction.
💡 Hint: It feels warm to the touch.
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Interactive Quizzes
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What does a negative ΔH indicate?
💡 Hint: It’s typically associated with burning fuels.
True or False: Standard enthalpy of formation values for all elements in their most stable states are zero.
💡 Hint: Think of natural states of common elements.
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Challenge Problems
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Calculate the ΔH_rxn° for the given reaction: 2 H₂(g) + O₂(g) → 2 H₂O(l) using the known ΔH_f° values.
💡 Hint: Remember to apply coefficients in the calculation.
Using Hess’s Law, derive the enthalpy change for the formation of glucose from carbon dioxide and water, reminding yourself of indirect pathways.
💡 Hint: Think about the cycle of creation and breakdown representing sugar synthesis.
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