Energy lost as both heat and work Energy lost only as heat ell (a) (b) Charged battery Heat Energy AE lost by battery Heat Work Discharged battery
Energy lost as both heat and work Energy lost only as heat ell (a) (b) Charged battery Heat Energy AE lost by battery Heat Work Discharged battery
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.56PAE: 9.56 Using heats of formation tabulated in Appendix E, calculate the heats of reaction for the...
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Question
If the battery is defined as the system,
what is the sign on w in part (b)?▲ Figure 5.10 Internal energy is a state
function, but heat and work are not. (a) A
battery shorted out by a wire loses energy to
the surroundings only as heat; no work is
performed. (b) A battery discharged through
a motor loses energy as work (to make the
fan turn) and also loses some energy as heat.
The value of ΔE is the same for both
processes even though the values of q and w
in (a) are different from those in (b).
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