eaccess3.lon-capa.illinois.edu ¢ LON-CAPA HEIIRetakequestion4 Untitled document

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eaccess3.lon-capa.illinois.edu ¢ LON-CAPA HEIIRetakequestion4 Untitled document Rachel Main Menu Contents Grades Morgan v (Student - section: O) CHEM 1020 Messages Courses Help Logout Summer 2018 ations Course Contents».. Retake for Hour Exam 2 HEIIRetakequestion4 Timer A system fitted with a piston contracts when it gives off 50.9 J of heat to the surroundings. The piston is working against a pressure of 0.629 atm. The final volume is 57.2 L. What was the initial volume of the system if the change in internal energy of the system is 979 1? Report your answer to the correct number of significant figures. Submit Answer Tries 0/2 Send Feedback

Explanation / Answer

Using first low of thermodynamic,

?U = Q + W

Q = -50 j = heat

Pext. = 0.629 atm

?U = 979 j = change in internal energy

W = work = -Pext.(Vf - Vi )

979 = -50 + W

W= 1029 J

W = - Pext. (Vf - Vi )

1029 = -0.629×(57.2- Vi ) × 101.3

V¡ = 73.35L

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