1.2 - Standard Enthalpy Changes
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Practice Questions
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Define standard enthalpy of formation.
💡 Hint: Refer to the making of substances from their basic elements.
What symbol denotes standard enthalpy changes?
💡 Hint: Think about the notation used to signify standard conditions.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the standard condition for pressure?
💡 Hint: Remember the basics of the metric system.
True or False: The standard enthalpy of formation for any element in its standard state is zero.
💡 Hint: Think about the foundational principles of formation.
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Challenge Problems
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Calculate the standard enthalpy change for the reaction
2 H₂(g) + O₂(g) → 2 H₂O(l) using the following values:
ΔH_f°[H₂O(l)] = -285.8 kJ/mol.
Why is this calculation significant in thermochemistry?
💡 Hint: You'll apply the formation values to derive the overall reaction enthalpy.
Given the formation enthalpy values of the products and reactants, determine the standard enthalpy of reaction for the following:
N₂(g) + 2 H₂(g) → 2 NH₃(g);
ΔH_f°[NH₃(g)] = -45.9 kJ/mol.
💡 Hint: Focus on ensuring the balanced equation before applying formation values.
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