Energy is added to 5 kg of air with a paddle wheel until ?T = 100°C. Find the magnitude of the paddle wheel work if the rigid container is insulated.
A) 424 kJ
B) 392 kJ
C) 358 kJ
D) 306 kJ
C) 358 kJ
The first law with Q = 0, is –W = ?U
?W = ?U = mCv?T = 5×0.717×100 = 358 kJ
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