13. Calculate the standard enthalpy of hydrogenation of cyclohexene to cyclohexa

Question

13. Calculate the standard enthalpy of hydrogenation of cyclohexene to cyclohexane given that of combustion of both these compounds are -3752 kWmole for -3953 kJ/mole for cyclohexane. cyclohexene and 14. What do you understand by the terms standard enthalpy of vaporisation: a'oeroin quantiht of lqudl s varorazd ot i) standard enthalpy of fusion: crtain temp. qucunhtht of haat that ugt he oselaed ii) standard enthalpy of sublimation: war 15. The standard enthalpy of combustion of graphite is -393.5 kJ mol-1 and that of diamond is -395.41 kJ mol-1, Calculate the standard enthalpy for the transition C(s. graphite) to Cis, diamond)? 16. An ice cube of mass 100 g is put into a glass of water at a temperature of about oc When the ice melts, 33 RJ of energy is absorbed from the surroundings as heat What is the change in entropy of (a the ice cubelb) the glass of water? What is the "system and what is the surrounding" in this example? 17.What is the standard enthalpy of vaporisation of liquid carbon dioxide at 298 K given the standard enthalpy of sublimation as 25.23 kJ mol-1, and the standard enthalpy of fusion as 8.33 kJ mol-1, at that temperature. 18. The standard enthalpy of formation for ammonia is -46.11 kJ/mol. Calculate the standard reaction entropy and the change in entropy of the surroundings at 298 K for the reaction involving the formation of ammonia. N2(g) + 3 H2(g)-- 2 NH3 (g) (8 points) Using the values you have deduced so far, calculate the standard Gibbs Free Energy for this reaction 4 points)

Explanation / Answer

Cyclohexene + H2 = Cyclohexane

then

HRxn = Cyclohexane - (Cyclohexene + H2 )

HRxn = (-3953) - (-3752 + 0)

HRxn = -201 kJ

the reaction will be exothermic, i.e. due to breaking of bonds

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