1.2.2.1 - Standard Enthalpy of Formation (ΔH_f°)
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Practice Questions
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What is the standard enthalpy of formation for oxygen gas (O₂)?
💡 Hint: Think about elements in their most stable form.
Is the reaction of hydrogen and oxygen to form water exothermic or endothermic?
💡 Hint: Recall the sign of ΔH_f° for water.
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Interactive Quizzes
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What does ΔH_f° represent?
💡 Hint: Think about what formation means in chemistry.
Which reaction has a negative ΔH_f° value?
💡 Hint: Consider standard formation reactions that release heat.
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Challenge Problems
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Using provided ΔH_f° values, calculate the enthalpy change for forming ammonia (NH₃) from nitrogen and hydrogen.
💡 Hint: Consult the standard enthalpy chart for reference.
Given the ΔH_f° values of H₂O(l) and CO₂(g), determine the ΔH for photosynthesis.
💡 Hint: Reverse reactions appropriately to apply Hess's Law.
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