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Thermodynamics and Thermochenistry Fundamentals

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Thermodynamics and Thermochenistry Fundamentals

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Questions and Answers

What is the purpose of the coffee cup calorimeter?

To measure the enthalpy change of a reaction.

To measure the heat of combustion of a substance.

To measure the heat transfer in a process open to the atmosphere. (correct)

To measure the heat capacity of a substance.

What is the primary difference between constant-pressure and constant-volume calorimetry?

One measures heat transfer, while the other measures heat capacity.

One is used for reactions at constant temperature, while the other is used for reactions at constant pressure.

One is used for open systems, while the other is used for closed systems. (correct)

One measures the heat of combustion, while the other measures the heat of reaction.

What is the formula for the heat transfer in a coffee cup calorimeter?

QH2O = Qsolid + msolidCsolid (Tfinal-Tinitial)solid

Qsolid = QH2O + msolidCsolid (Tfinal-Tinitial)solid (correct)

QH2O = Qsolid - msolidCsolid (Tfinal-Tinitial)solid

Qsolid = QH2O - msolidCsolid (Tfinal-Tinitial)solid

What is the specific heat of water in J/g°C?

4.184 J/g°C (D) Signup and view all the answers

What is the purpose of a bomb calorimeter?

To measure the heat of combustion of a substance. (D) Signup and view all the answers

What is the formula for the heat of reaction in a bomb calorimeter?

Qreaction = -(Qwater + Qcal) (D) Signup and view all the answers

What is the heat capacity of the calorimeter in J/°C in the example problem?

890 J/°C (D) Signup and view all the answers

What is the temperature increase of the water in the example problem?

9.0°C (A) Signup and view all the answers

What is the purpose of the heat of reaction?

To measure the enthalpy change of a chemical reaction. (A) Signup and view all the answers

What is the unit of the heat of combustion in the example problem?

kJ/mol (D) Signup and view all the answers