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PYQ SK025 CHP 2 QUESTION.pdf - PYQ CHAPTER 2:...

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PYQ CHAPTER 2: THERMOCHEMISTRY2011 / 20121.(a)i.Define standard enthalpy of combustion.ii.The enthalpy of combustion of benzoic acid is -3226.7 kJmol-1. When 3.2 gbenzoic acid, C6H5COOH is completely combusted in a bomb calorimetercontaining 2.0 kg of water, the temperature of the water increased by 3.8C.Calculate the heat capacity of calorimeter.[6 marks]2012 / 20131(a)Calculate the enthalpy of hydration of Cl-in the dissolution process of LiCl in waterusing energy cycle method.[6 marks]
Prepared by: Miss Balqis2013 / 20141(a)Solid pentaluminiumnonahydride, Al5H9, burns vigorously in oxygen to givesolid aluminium oxide, Al2O3, and water, H2O.(i)State Hess’s law.(ii)By using Hess’s law, calculate ∆Hofor the combustion of Al5H9Given:∆Ho(Al2O3(s))=−1669.8 kJ mol∆Ho(Al5H9(s))=−95.4 kJ mol∆Ho(H2O(l))=−285.8 kJ mol.-1-1

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Term
Fall
Professor
Mr Husni Hajali
Tags
Enthalpy, Miss Balqis

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