A rigid tank contains 4 kg air at 300◦C, 4 MPa that acts as the hot energy reservoir for a heat engine with its cold side at 20◦C, shown in Fig. P6.99. Heat transfer to the heat engine cools the air down in a reversible process to a final 20◦C and then stops. Find the final air pressure and the work output of the heat engine.

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W Он, (HE, Air Н.Е. 20°C FIGURE P6.99