HW Problem 8.9 6th edition

[Jim Brown 14B Lec1]

8.9 An ideal gas in a cylinder was placed in a heater and gained 5.50 kJ of energy as heat. If the cylinder increased in volume from 345 mL to 1846 mL against an atmospheric pressure of 750. Torr during this process, what is the change in internal energy of the gas in the cylinder?

[EllerySchlingmann1E]

For this problem, you want to calculate q and w separately and then use the equation delta U = q + w to find the total change in internal energy. q is simply given as 5.5 kJ, but you will need to calculate w using the -P*deltaV equation. Once you have the energy of the work done by the system, you can add it to your energy as heat and find your change in internal energy. Hope that helps!

[GavinAleshire1L]

You take the steps above except you have to make sure your pressure units work out to yield Joules.It may be helpful to convert the torr to atm and then convert the answer using 101.325 J = 1 L atm.