Question

4. Using an appropriate diagram, briefly explain the difference between the [a] work done by a system during a multi-stage irreversible and reversible expansion. Menggunakan rajah yang bersesuaian, terangkan secara ringkas perbezaan antara kerja yang dilakukan oleh suatu sistem somasa pengembangan berbilang bagi peringkat berbalik dan tidak berbalik. (30 marks/markah) [b Calculate the standard entropy change of the following reaction at 727 °C. Kira perubahan entropi piawai bagi tindak balas berikut pada suhu 727 °C 2.Ai+3/2 0.Al,0, A S 313.26 J/K/mol Given/ Diberi 659 °C Melting point of aluminium / Takal lebur aluminium Heat of fusion of aluminium at the melting point / Haba pelakuran aluminium pada takal lebur = 10,460 J/mol C i 105.19 J/K/mol = 31.67 J/K/moi CPArelid) = 28.28 J/K/mol CA Ciquid = 29.29 J/K/mol (40 marks/markah)

Answer 1

ACOS 2Al t 2 313.26 Tmstk 98 298 298 -313.26 J outs nP C.aod dT 299 105. 19 n T 248 293 T- 1000K 121as E 127.35T molk 2a8

Rastants AH tants 298 T 432 (2) Ct (2) Cenetes T 32 228 AH 2 Tastoro 298 432 b6o 2) (24.29\d (2) (28.29 T T 932 1000 248 (31.61) 10460 932 + + T 298 +58.53 n loso Qt32 56.56 Pal932 298 41.Sos Qn (loos 298 I22 + 131.34 T/ HanorsPro haex

-3 13 26 127.35-1313 fest - 323.25 J L000