Problem 5.4: For each of the following conditions, compute (i) the mechanical work w done by a sample of dry air, and (ii) the heat q added to the sample. a) Isothermal compression to one-fifth of its original volume at 15°C. -1 -1 Answer: (i) -1.3 × 105 J kg-¹ (ii) -1.3 × 105 J kg-¹ b) Isobaric heating from 0°C to 20°C. Answer: (i) 5.7 x 103 J kg-¹ (ii) 2.0 × 104 J kg-1 x

Problem 5.4: For each of the following conditions, compute (i) the mechanical work w done by a sample of dry air, and (ii) the heat q added to the sample. a) Isothermal compression to one-fifth of its original volume at 15°C. -1 -1 Answer: (i) -1.3 × 105 J kg-¹ (ii) -1.3 × 105 J kg-¹ b) Isobaric heating from 0°C to 20°C. Answer: (i) 5.7 x 103 J kg-¹ (ii) 2.0 × 104 J kg-1 x