A 2.00 x 10-3 m3 of Oxygen gas (O2) has an initial temperature and pressure of 200 K at 1 atm (101,300 Pa).        The gas undergoes four processes:    AB: Heated at constant V to 400 K.  BC: Heated at constant P to 800 K.  CD: Cooled at constant V back to 1 atm (101,300 Pa)  DA: Cooled at constant P back to 200 K  How many moles of O2are present?  What is the pressure(in Pascals) at point B?  Find Q, U and W for process AB.

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