sorry, the question is : A piston-cylinder device contains 0.95 kg of oxygen initially at a temperature of 27 Celsius and a pressure, due to the ambient atmospheric pressure and a weight on the top of the piston, of 150 kPa. Heat is added to the gas until it reaches a temperature of 627 Celsius . Determine the amount of heat added to the gas during the process.
Q-W=Delta U
how does delta E= delta U= m(u2-u1)=m*c*(T2-T1)?delta U = Q is only correct under constant volume, for which has no work. so, since this thing is changing its volume, what happened to the work done by the system, its not in the equation. (this is from the book),as far as I know, m*c*(T2-T1) is just Q, heat energy.
and yeah, u as specific energy makes sense to me...just first time seeing specific energy. Thank You!