Chemistry

Chemistry

Problem

Two independent processes occur simultaneously in an isolated system: Process X: ΔSsys=+18 J K−1\Delta S_{\text{sys}} = +18\,\text{J}\,\text{K}^{-1}, ΔSsurr=−4 J K−1\Delta S_{\text{surr}} = -4\,\text{J}\,\text{K}^{-1} Process Y: ΔSsys=−12 J K−1\Delta S_{\text{sys}} = -12\,\text{J}\,\text{K}^{-1}, ΔSsurr=+6 J K−1\Delta S_{\text{surr}} = +6\,\text{J}\,\text{K}^{-1} a. (i) For each process taken separately, decide whether it is spontaneous, reversible or impossible. b. (ii) Find the overall ΔSuniv\Delta S_{\text{univ}} when both processes occur together and state whether the combined process is allowed by the second law.

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