The initial temperature and pressure of 8000 cm3 of air are 300°C and 800 kPa, respectively. The necessary heat transfer, if the volume does not change and the final pressure is 200 kPa, is nearest:
A) ?12 kJ
B) ?22 kJ
C) ?32 kJ
D) ?42 kJ
A) ?12 kJ
The final temperature is found using the ideal-gas law. The 1st law is then applied:
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