A cylinder of ideal gas is closed by an 8.00 kg movable piston (area = 60.0 cm²) as illustrated in Fig. 20-5. Atmospheric pressure is 100 kPa. When the gas is heated from 30.0 °C to 100.0 °C, the piston rises 20.0 cm. The piston is then fastened in place, and the gas is cooled back to 30.0 °C. Calling ΔQ₁ the heat added to the gas in the heating process, and ΔQ₂ the heat lost during cooling, find the difference between ΔQ₁ and ΔQ₂.

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Piston Gas Fig. 20-5