l645-6.60) he due date for the following problems will be anno (b) we change int

Question

l645-6.60) he due date for the following problems will be anno (b) we change inthe sy stem,and it has 115 1 of work done by it, compute (b) When 2 1(16 pts) (a) If 28 problems will be announced in class. o pts) (a) If pts) (a) If 285 3 of J of heat are (b) werthe internal energy,. and interet the siga of your resut .50 to from 0.002.50molesofNigeergy, and interpret having a corsian pressure of 175 atm 00 to 125 , calculate the tn 0,00 Interpret the sign of your answer nterpret the sign of veae work, expmessed inJ, associated with this process

Explanation / Answer

1) From first law of thermodynamics

Change in internal energy= Q+W

Q and W are +Ve if added to the system

Change in internal energy= 285+115= 400 joules

2) For a constant pressure process

work done = -nR ( T2-T1), n= number of moles of gas

R= 8.314 Joule/mole.K T2=125 deg.c T1= 0 deg.c

Work done = -2.5*8.314*(125-0) =-2538. 125.

Heating at constant pressure leads to expansion of gas and gas does work

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