1.7 - Practice Problems for Section 1
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Practice Questions
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Determine if the following reaction is exothermic or endothermic: H₂(g) + ½ O₂(g) → H₂O(l).
💡 Hint: Refer to the standard enthalpy of formation values.
Identify the enthalpy of formation for CO₂(g).
💡 Hint: Standard formation values should be in reference tables.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What type of reaction occurs if ΔH is negative?
💡 Hint: Think about the definitions of exothermic and endothermic reactions.
Do standard enthalpies of formation apply to reactions at any temperature?
💡 Hint: Consider what 'standard conditions' means in thermochemistry.
1 more question available
Challenge Problems
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Calculate the enthalpy change for the reaction: 2 H₂(g) + O₂(g) → 2 H₂O(g). Given ΔH_f°[H₂O(g)] = -241.8 kJ/mol.
💡 Hint: Use the standard enthalpy of formation for water and apply the equation properly.
Using Hess's Law, determine the enthalpy change for the combustion of 1 mole of C2H6(g) given the following equations: ΔH for C2H6(g) → 2C(s) + 3H2(g) and C(s) + O2(g) → CO2(g) with their respective ΔH values.
💡 Hint: Remember to reverse any equations if necessary and change the sign of the enthalpy.
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