In a bomb calorimeter, the heat of reaction measured corresponds to the change in
Correct answer: B. internal energy, since the volume is constant
- A. enthalpy, since the pressure is constant
- B. internal energy, since the volume is constant
- C. entropy
- D. free energy
Explanation
A bomb calorimeter is a sealed rigid vessel, so the volume cannot change, no expansion work is done and all the energy released appears as heat, which equals the change in internal energy. A reaction in an open vessel is at constant pressure and gives the enthalpy change instead. The two differ only by the work done pushing back the atmosphere.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Internal Energy
Internal energy is the total microscopic kinetic and potential energy of a system and is a state function. The first law, ΔU = q + w, connects changes in internal energy with heat and work, including sign conventions, expansion or compression and constant-volume processes.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Internal Energy questions
Internal energy of a system is the
The second nuclear weapons used in warfare over Nagasaki, Japan, contain energy equal about of TNT?
If internal energy of the system is increased ____________________?
The value of (∆H−∆U) for the formation of carbon monoxide (CO) from its elements at 298 K is: (R = 8.314 J K⁻¹ mol⁻¹)
The internal energy of an ideal gas depends upon its: