15% O ..ooo AT&T; 3:28 PM session masteringphysics.com C Exercise 19.12 Masterin

Question

15% O ..ooo AT&T; 3:28 PM session masteringphysics.com C Exercise 19.12 MasteringPhysics Exercise 19.12 A gas in a cylinder is held at a constant pressure of 2.27xIOS Pa and is cooled and compressed from a volume of I.7I m to l m3.The internal energy of the gas decreases by l.43x l J. Part A Find the work done by the gas. Express your answer using three significant figures. WE Submit Give Up Part B Find the absolute value QI of the heat flow into or out of the gas. Express your answer using three significant figures. Give Up Submit

Explanation / Answer

Constant Pressure P = 2.27*10^5 Pa

Initial volume V = 1.71 m^3

Final volume V' = 1.11 m^3

Decrease in internal energy dU = -1.43*10^5 J

(a) Work done by the gas
W = P ( V'– V )

w = 2.27*10^5*(1.11-1.71)

w = -136200 J

(b) the absolute value of the heat

Q = dU + W

Q = -1.43*10^5 + (-136200)

Q = -279200 J

Q is negative.so, heat flow out of the gas

(c) state the direction of the heat flow

out of the gas

(d) Gas is not ideal

Since there is an change in internal energy

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