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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 9
added to the sample.
a) Isothermal compression to one-fifth of its original volume at
15°C.
Answer: (i) -1.3 x 105 J kg-¹ (ii) -1.3 × 105 J kg-1
-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
-1

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