4.1 - Enthalpy Changes
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Practice Questions
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Define enthalpy.
💡 Hint: Think about heat content related to pressure.
What does it mean if a reaction is exothermic?
💡 Hint: Remember the heat flow direction.
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Interactive Quizzes
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What is the enthalpy change for an exothermic reaction?
💡 Hint: Consider the heat flow direction.
True or False: Standard enthalpy of formation for an element in its standard state is zero.
💡 Hint: Think about formation and its relation to enthalpy.
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Challenge Problems
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Given the following reaction: C(graphite) + O₂(g) → CO₂(g), calculate the standard enthalpy change if ΔH_f°(C(graphite)) = 0 kJ mol⁻¹ and ΔH_f°(O₂(g)) = 0 kJ mol⁻¹, and ΔH_f°(CO₂(g)) = -393.5 kJ mol⁻¹.
💡 Hint: Use the enthalpy of formation values provided.
If a calorimeter reads an initial temperature of 20°C and after a reaction, it reads 25°C with 100g of water, how much heat was absorbed?
💡 Hint: Convert between different units if necessary.
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