8 ft3 rigid, sealed tank contains ammonia (NH3) at its critical temperature and pressure. Calculate the mass of the ammonia in the tank by three methods: a. by using the Thermodynamic Properties of Ammonia Table, b. by assuming that the ammonia is an ideal gas, and c. by using the Compressibility Factor Equation of State. What is the compressibility factor Z? d. Of these three answers for the mass, which is the most accurate? Which is the least accurate? e. Now the ammonia in the tank is cooled to a final temperature of 1°F. Using the Thermodynamic Properties of Ammonia Table, determine the final pressure and quality of the ammonia. f. Calculate the required heat transfer for part e.

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