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Chrome File Edit View History Bookmarks People Window Help Mastering Physics: Chapter 19 Homework https:// session.masteringphysics.com/ myct/itemView?offse next&assignmentProblemID; 16882 MIPABRAHAM2 5242016S Chapter 19 Homework Exercise 19.20 Exercise 19.20 Part A When a quantity of monatomic ideal gas expands at a What is the change in the internal energy of the gas? constant pressure of 4.00 x 10 Pa, the volume of the gas increases from 2.00 x 10-3 m to 8.00 x 10-3m3 AU Submit My Answers Give U S 83% Thu 1:41 AM E Signed in as Tanner Calloway Help Close Resources previous l 7 of 11 l next Continue Provide Feedback

Explanation / Answer

change in internal energy of the gas is n Cv deltaT where Cv for monoatomic gas is 1.5 R.

Then change in internal energy = 1.5 nR delta T

But for an ideal gas PV = nRT

Hence, change in internal energy = 1.5 P delta V = 1.5*4*10^4*(8*10^-3-2*10^-3) = 360 J

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