Part A Problem 15.04 Calculate the work done by the gas. A gas is enclosed in a

Question

Part A Problem 15.04 Calculate the work done by the gas. A gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. When 254 kcal of heat is added to the gas, the volume is observed to increase slowly from 12.0 m3 to 16.2 m3 Express your answer with the appropriate units. W-Value Units Submit My Answers Give Up Part B Calculate the change in internal energy of the gas Express your answer with the appropriate units AUValueUnits Submit My Answers Give Up Provide Feedback Continue

Explanation / Answer

PART A

Atmospheric pressure = 1.01325*105 N/m2

W = P*V

=> W = (1.01325*105)*(16.2 - 12)

=> W = 4.26*105 J

PART B

Q = 254 kcal = (254*4.2) kJ = 1066.8 kJ = 10.6*105 J

Q = U + W

=> 10.6*105 = U + 4.26*105

=> U = 6.34*105 J

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