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19. (II) An ideal gas expands at a constant pressure of 120 kPa from a to b; see Fig. 19.19. It is then compressed isother-mally

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19. (II) An ideal gas expands at a constant pressure of 120 kPa from a to b; see Fig. 19.19. It is then compressed isother-mally to point c where the volume is 40 L. Find the work done by the gas during (a) the expansion, (b) the compres- sion. P(kPa) 180 150 120 V(L) 30 40 50 FIGURE 19.19 Exercise 19

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