2. A compression at a constant pressure of 20 kPa is performed on 9.0 moles of an ideal monatomic gas (Cv-1.5R). The compression reduces the volume

of the gas from 0.26 m3 to 0.12 m3. What is the change in the internal energy of the gas? Let the ideal-gas constant R = 8.314 J/(mol. K).
0 -7.0 kj
O zero
4.2 kJ
O-4.2 k]
O 7.0 kj

Physics
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