Coffee Cup Calorimeter - Calculate Enthalpy Change, Constant Pressure Calorimetry | Summary and Q&A

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September 22, 2017
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The Organic Chemistry Tutor
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Coffee Cup Calorimeter - Calculate Enthalpy Change, Constant Pressure Calorimetry

TL;DR

Learn how to use a coffee cup calorimeter to calculate the enthalpy change for the dissolution of calcium chloride.

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Questions & Answers

Q: How does the coffee cup calorimeter work to measure enthalpy change?

The styrofoam cup insulates the system, preventing heat transfer. The temperature change in the water indicates whether the reaction is exothermic or endothermic.

Q: How is the enthalpy change calculated for the reaction?

The enthalpy change is calculated by dividing the heat energy absorbed by the water by the number of moles of calcium chloride.

Q: Why is the enthalpy change negative for the dissolution of calcium chloride?

The negative sign indicates that the reaction releases heat. The dissolution of calcium chloride is an exothermic process.

Q: How is the mass of water converted to grams?

The density of water is approximately one gram per milliliter, so the mass of water is equal to its volume in milliliters.

Summary & Key Takeaways

  • The video explains how to use a coffee cup calorimeter to measure the enthalpy change for the dissolution of calcium chloride.

  • The coffee cup calorimeter consists of a styrofoam cup, water, calcium chloride, and a thermometer.

  • The temperature change in the solution indicates whether the reaction is exothermic or endothermic.

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