A gas originally occupies a volume of 0.5 m3 at a pressure of 100 kPa. It is slowly allowed to expand until the volume is 2.5 m3. Assuming the temperature is kept constant, the final pressure will be
A. 10 kPa.
B. 50 kPa.
C. 500 kPa.
D. 100 kPa.
E. 20 kPa.
Answer: E
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