Question

180 PART D BAHAQIAN D Caludate the standard enthalpy of reaction et 25 C end i atm oress of the following reaction: Kirskan ent plawel tndak beles pede 25 "C and lekanen f aim bagi indek beles berat aso a Given/Dbert aste 303 )so, AH-792 k sO)S Co) : Ao-297 k (40 markatmakah) Caloulate the entrepy change of the system and the surroundings for the Isothermal freezing of 1 mal of supercooled liquid sapper at 900 C when She suroundings are also at the same temperature. Assume that C, for Siquid copper also holds good for supercooled tliquidi copper. Kinekan penubahan entropi siastom dan persekfaran untuk pembokuan lacterm bagi 1 mal cecafr aupor-dingin tembaga pada auhu 900 C apebile parsakitaran mompunyal suhu yang semta. Andalken C unluk cecair tembege Juge boleh digunapakal untuk cocair aupardingin lembega Given/ Dibert TMeting potnt of coppec takat tebur tembaga1083 C Heat of fusion of copper at meting poin haba pelakuran tembega pada takat lebur 12070 Jinl C 22.04+8.28 10T Jnmol Ca 31.38 Jmol (80 markalmarkah -raent p PART D/ BAHAGIAN D Calculate the standard enthalpy af reaction at 25 C and 1 atm pressure of the following reaction: Kirakan entalpi piawai tindak balas pada 25 °C and tekanan 1 atm bagi tindak balas berkut 2s02(g)+02(g) 2503(g) Given / Dibert 2SKS)302(g)2s03(g) ; AH° = -792 kJ s0, (g)So,@) ; AHo = -297 k (40 marks/markah) Calculate the entropy change of the system and the surroundings for the isothermal freezing of 1 mol of supercooled liquid copper at 900 °C when the surroundings are also at the same temperature. Assume that C, for liquid copper also holds good for supercooled liquid copper. Kirakan perubahan entropi sistem dan persekitaran untuk pembekuan isoterma bagi 1 mol cecair super-dingin tembaga pada suhu 900 °C apabila persekitaran mempunyai suhu yang sama. Andaikan C, untuk cecair tembaga juga boleh digunapakai untuk cecair super-dingin tembaga Cute)-u () Given / Dibert T Melting point of copper/ takat lebur tembaga= 1083 °C 4. Heat of fusion of copper at meting point haba pelakuran tembaga pada takat lebur 12970 J/mol 316T C22.84+6.28 x 103 T JK/mol 4C 31.38 JIK/mol

Answer 1

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