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Unformatted text preview: .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *N35131A01724* www.XtremePapers.net 17 Turn over (iv) A student suggested that the results would be more accurate if a thermometer which read to 0.1°C was used. Explain why this would not improve the accuracy of the result. A calculation is not required. (1) ............................................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (d) Hex-1-ene can be converted to hexane in the following reaction. C6H12(l) + H2(g) → C6H14(l) (i) What catalyst is used in this reaction? (1) ............................................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (ii) The enthalpy change of this reaction ∆Hreaction can be calculated from the following enthalpy changes of combustion. Substance Enthalpy change of combustion /kJ mol–1 Hex-1-ene, C6H12 –4003 Hydrogen, H2 –286 Hexane, C6H14 –4163 Complete the Hess cycle by adding labelled arrows. Use your cycle to calculate the enthalpy change ∆Hreaction. (3) ∆Hreaction C6H12(l) + H2(g) C6H14(l) 6CO2(g) + 7H2O(l) ∆Hreaction = 18 ........................................................................ *N35131A01824* www.XtremePapers.net kJ mol–1 (iii) The enthalpy change for the reaction of some other alkenes with hydrogen is shown below. Reaction Standard enthalpy change / kJ mol–1 C3H6 + H2 → C3H8 –125 C4H8 + H2 → C4H10 –126 C5H10 + H2 → C5H12 –126 Explain why the values are so similar. (1) ............................................ . . ....
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This note was uploaded on 09/22/2013 for the course CHEMISTRY Organic Ch taught by Professor Yang during the Fall '12 term at British School Of Washington.

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