15. Consider 2.0 mole of a monatomic ideal gas that is taken from state A (P_A= 2.0 atm, V_A= 10.0 L) to state B (P_B= 2.0 atm, V_B= 30.0 L), and then to state C (P_C= 1.0 atm, V_c= 30.0 L). Calculate ΔE_AB (in atm L).
(A)30
(B)36
(C)45
(D)52
(E)60

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