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Refrigerant-134a is expanded adiabatically from 100 psia and 100°F to a saturated vapor at 10 psia. Determine the entropy generation for this process, in Btu/lbm⋅R.<image 1> (A) (B) (C) Answer with the option's letter from the given choices directly. No punctuation. | A Expected Answer: B Difficulty: Medium Subfield: Thermodynamics |