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The enthalpy of reaction, 2HC = CH + 5O_(2) rightarrow 4CO_(2) + 2H_(2)O If the bond energies of C-H, C=C, O=O, C=O and O-H bonds are p,q,r,s,t repectively

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Three Carnot engines operate in series between a heat source at a temperature T_1 = 600 K and heat sink at temperature T_4 = 100K (see figure). There are two other reservoirs at temperature T_2 " and " T_3 as shown, with T_1 gt T_2 gt T_3 gt T_4 The three engines are equally efficient if: