An insulated tank that contains 2.6 kg of O2 at 15°C and 300 kPa is connected to a 2-m³ uninsulated tank that contains N2 at 50°C and 500 kPa. The valve connecting the two tanks is opened, and the two gases form a homogeneous mixture at 25°C. Assume To = 25°C. 0₂ 15°C 300 kPa N₂ 2 m³ 50°C 500 kPa

Problem 1. Initially, 0.05kg of air is contained in a piston cylinder device at 200 °C and 1.6 MPa. The air then expands at constant temperature to a pressure of 0.4 MPa. Assume the process occurs slowly enough that the acceleration of the piston can be neglected. The ambient pressure is 101.35kPa. (i) Determine the work (kJ) performed bt the air in the cylinder on the piston. (ii) Determine the work (kJ) performed by the piston on the ambient environment. Neglect the cross- sectional area of the connecting rod. (iii) Determine the work transfer (kJ) from the piston to the connecting rod. Neglect friction between the piston and cylinder. Assume that no heat transfer to or from the piston occurs and that the energy of the piston does not change.

The wall separating the two compartments is removed and the two gases are allowed to mix. Assuming constant specific heats, find the simplest expression for the mixture temperature written in the form where m3 and T3 are the mass and temperature of the final mixture, respectively

Argon (K=1.667) gas is compressed from 1 atm and 30°C to a pressure of 10 atm adiabatically. The lowest temperature of helium after compression is O 488°C 556°C 370°C 264°C 194°C 144°C 106°C 75°C O non of the above