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AS ENERGETICS TEST 2017Name: ___________________________TOTAL MARKS 23Structured Questions1. The standard enthalpy change of combustion of C2H2, ∆Hoc, is –1300 kJ mol–1at 298 K.Values of relevant standard enthalpy changes of formation, ∆Hofof, measured at 298 K,are given in the table(i)Write balanced equations, with state symbols, that representthe standard enthalpy change of combustion ∆Hoc, of C2H2, andthe standard enthalpy change of formation, ∆Hof, of C2H2.(ii)Use the data above and your answer to(i)to calculate the standard enthalpy change offormation, ∆Hof, of C2H2.Show clearly whether the standard enthalpy change of formation of C2H2has a positive or negativevalue.[Total:6]
AS ENERGETICS TEST 2017Name: ___________________________TOTAL MARKS 232. Ethyne is commonly called acetylene. It is used in an oxy-acetylene flame which is hot enough tocut through steel. Ethyne completely combusts as shown in the equation below.(a) Calculate the enthalpy change of combustion of ethyne using the average bond enthalpies in thetable below.

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Term
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Tags
Enthalpy, Standard enthalpy change of formation, ethyne, rdx, Standard enthalpy change of combustion

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