4.2 - Problem 2: Coffee-Cup Calorimetry
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Practice Questions
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What is the purpose of a coffee-cup calorimeter?
💡 Hint: Think about what you measure in chemistry related to energy.
State the equation to calculate heat absorbed by the solution.
💡 Hint: Identify what each symbol in the equation stands for.
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Interactive Quizzes
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What is the main purpose of using a coffee-cup calorimeter?
💡 Hint: Think about what type of energy changes we focus on in reactions.
True or False: The heat absorbed by the solution is equal to the heat released by the reaction.
💡 Hint: Consider the sign of heat flow in reactions.
1 more question available
Challenge Problems
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In an experiment, 50 mL of 0.1 M NaOH is mixed with 50 mL of 0.1 M HCl at room temperature. If the temperature rises from 25.0 °C to 30.0 °C, calculate the change in enthalpy assuming complete neutralization of NaOH and HCl. Assume the density of the solution is 1 g/mL and the specific heat capacity is 4.18 J/(g·°C).
💡 Hint: Keep track of moles and ensure you convert units correctly.
You perform a calorimetry experiment using 50 g of KNO3 dissolved in 200 g of water. The initial temperature is 25.0 °C, and the final temperature after dissolution is 20.0 °C. Calculate the enthalpy change of dissolution per mole of KNO₃. Molar mass of KNO₃ is 101.1 g/mol.
💡 Hint: Remember that when temperature decreases, heat is absorbed by the surroundings.
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