189. An ideal gas with a molecular weight of 7.1 kg/kg mol is compressed from 600 kPa and 280

K to a final specific volume of 0.5 m3

/kg. During the process the pressure varies according to P =

620 + 150υ + 95 υ

2 where p is in kPa and υ in m3

/kg. Calculate the work of compression in kJ/kg.

A. 32.8 B. 28.7

C. 35.6 D. 33.3