Question: A 10-ft3 tank contains oxygen initially at 14.7 psia and 80F. A paddle wheel within the tank is rotated until the pressure inside rises to

A 10-ft3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the surroundings. Determine the paddle-wheel work done. Neglect the energy stored in the paddle wheel.

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