6. Consider the quasi-static expansions of a ideal gas between equilibrium states A and C in Fig. right. Suppose p1=2.10

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6. Consider the quasi-static expansions of a
ideal gas between equilibrium states A and C in Fig.
right.
Suppose p1=2.10 × 10^5 N/m2, p2=1.05 × 10^5
N/m2, V1=2.25 × 10^-3 m3 and V2=6.75 × 10^-3 m3.
If 615 J of heat is added to the gas as
traverse path ABC:
(a) How much heat is required for the transition to
ADC length?
(b) What was the change in internal energy for the
ABC road?
(c) How much was the change in internal energy for the CDA
path?