5.4 - Enthalpy change, ∆rH of a reaction – Reaction Enthalpy
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Practice Questions
Test your understanding with targeted questions
What is the formula for calculating reaction enthalpy?
💡 Hint: Think about the relationship between products and reactants.
Explain what Hess's Law states.
💡 Hint: Consider it like a shortcut to finding enthalpy for complex reactions.
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Interactive Quizzes
Quick quizzes to reinforce your learning
Which of the following defines enthalpy change (∆rH)?
💡 Hint: Consider which option references heat specifically.
True or False: Hess's Law allows us to determine enthalpy changes for reactions that cannot be measured directly.
💡 Hint: Does it state you can only measure directly?
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Challenge Problems
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Calculate the reaction enthalpy for the combustion of butane given: ∆Hf°(C4H10) = -125.6 kJ/mol, ∆Hf°(CO2) = -393.5 kJ/mol, ∆Hf°(H2O) = -285.8 kJ/mol. The reaction is C4H10 + 13/2 O2 → 4CO2 + 5H2O.
💡 Hint: Consider the stoichiometric coefficients in your calculations.
Explain how the enthalpy change differs between a reaction done at high versus low temperature, specifically in relation to spontaneity.
💡 Hint: Think about how temperature influences movement.
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