(a)If 375J of heat are absorbed by the system, and it has 425 cal of work done by it, compute the change in the internal energy, and interpret the sign of your result. 1 cal= 4.184J

(b)When 3.50 moles of N2(g) is heated in a piston having a constant pressure of 3.00 atm from 0.00 degrees Celsius to 225 degrees celcius, calculate the work, expressed in J, associated with this process. Interpret the sign of your answer.

Yes you are correct if you are a physicists because physicists use the sign convention said by you but in chemistry the sign convention is just the opposite as explained by me.There may arouse a lot of confusion therefore please remember this sign convention.

I have given the sign convention considering the Chemistry point of view:

Work done by the system=negative

Work done on the system=Positive

But in Physics

Work done by the system=positive

Work done on the system=negative.

Please consider which subject this question is from and accordingly put the sign.

Thanks

Nov 11th, 2015

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