Question
The figure shows a pV diagram for 7.6 g of nitrogen gas (N2) in a sealed container. The temperature T 1 of the gas in state 1 is 53 degree C. What are (a) the pressure p 1 of the gas in state 1 and (b) the temperature T 2 of the gas in state 2? The ideal gas constant is R = 8.314 J/mol middot K = 0.0821 L middot atm/mol middot K, and the ATOMIC weight of nitrogen is 14 g/mol. The figure (not to scale) shows a pV diagram for 2.4 g of helium gas (He) that undergoes the process 1 rightarrow 2 rightarrow helium is 4.0 g/mol. The figure shows the pV diagram for a certain thermodynamic process. In this process, 1940 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 7 x 104 Pa. If the volume of the system increases from 0.020 m3 to 6x10-2 m3, calculate the change in internal (thermal) energy of the system. If the internal (thermal) energy change is nonzero, be sure to indicate whether this energy change is positive or negative. What is the total translational kinetic energy in a test chamber filled with nitrogen (N2) at 2.10x105 Pa and 20.7 degree C? The dimensions of the chamber are 5.00 m x 4.20 m x 6.10 m. The ATOMIC weight of nitrogen is 28.0 g/mol, Avogadro's number is 6.022 x 1023 molecules/mol and the Boltzmann constant is 1.38 x 10-23 J/K.
Explanation / Answer
1) c hint: PV = nrt, as we know V n r and t we get P as 73atm and using same formula T2 as 650.
2)d (23 litres) again use PV = nrt, and t = 657C
3)Internal energy change is 0 for all cyclic processes.
4)
