Enthalpy questions.pdf - gChemistry Name 2.3.1 Enthalpy...

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gChemistry Name .................................................. Greenhead College 1 2.3.1 Enthalpy Changes Exam Questions 1. The standard enthalpy change of formation of hexane is 199 kJ mol 1 . Using the axes below, show the enthalpy profile diagram for the formation of hexane. On your diagram label the enthalpy change of reaction, H , and the activation energy, E a . [Total 3 marks] 2. Alkanes are important hydrocarbons since they are used as fuels in homes and in industry. It is important that the enthalpy changes involved in alkane reactions are known. (i) Define the term enthalpy change of formation of a compound . ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... [2] (ii) Write the equation, including state symbols, that accompanies the enthalpy change of formation of hexane, C 6 H 14 (l). [2] (iii) What conditions of temperature and pressure are used when measuring the standard enthalpy change of formation? temperature ............................................................... pressure ......................................................... [1] [Total 5 marks] enthalpy reaction pathway
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