4. A piston cylinder arrangement contains nitrogen at 30 C and 3 bar. It may be considered ideal. a. If the volume is 1 m³, how many mols are present? b. If the gas is compressed isothermally to 6 bar, i. What is the volume? ii. What is the temperature? iii. How much work is done on the nitrogen? iv. How much work is done on the surroundings? v. If we return the piston to the original position, what will the pressure be? c. Lets go back to the original condition. i. If we heat the gas up to 100 C, what will the volume be? ii. How much work is done on the surroundings?

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