THERMODYNAMIC PROCESSES the IDEAL GAS and the FIRST LAW 15 0 411 moles of Argon initially at 20oC 1 00x105 Pa is ISOVOLUMETRICALLY heated to an elevated 3 00x105 Pa pressure This high pressure gas then expands ISOTHERMALLY to a final 1 00x105 Pa pressure NOTE T K T oC 273 R 8 314 J mol K CV 3R 2 pV nRT ETH nCvT Qi f Wi f ETH Wi f pdV a Represent the states and processes on a p V Diagram 2 b Complete the STATE ANALYSIS 5 STATE 1 2 3 V m3 10 01x10 3 10 01x10 3 30 03x10 3 NOTE V1 nRT1 p1 and V2 V1 isochoric process T2 p2V2 nR T3 T2 and p2V2 p3V3 isothermal process ETH nCV T P Pa 1 00x105 3 00x105 1 00x105 ETH J 1502 4505 4505 T K 293 879 879 c Complete the FIRST LAW ANALYSIS 8 PROCESS 1 2 2 3 Entire two stage process Qi f 3 003 3 300 6303 Wi f 0 3 300 3 330 ETH 3 003 0 3 003 NOTE 1 2 isochoric process so W1 2 0 2 3 isothermal process so ETH 0 and W2 3 nRT2 ln V3 V2 0 411 8 314 879 ln 3 3 300 J FIRST LAW of THERMODYNAMICS Qi f Wi f ETH
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