85. For convenience, the “int” subscript for the internal energy will be omitted in this solution. Recalling Eq. 19-28, we note that cycle0E=¦, which gives 0.ABBCCDDEEAEEEEE→→→→→Δ+Δ+Δ=Since a gas is involved (assumed to be ideal), then the internal energy does not change when the temperature does not change, so
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