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6 kg of an ideal gas is in a volume of 1 m3 at 250°C. The gas undergoes a constant pressure change of state until the temperature is 500°C.
a. Find the pressure at the initial state (MPa).
b. Find the volume at the final state (m3).
c. Find the change in enthalpy of the process (kJ).
d. Find the heat transfer for this process (kJ).
A container of volume 23 cm3 is initially filled with air. The container is after that evacuated at 0oC to a pressure of 30 mPa. How many molecules are in the container after evacuation if we suppose that air is an ideal gas.
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