9, Calculate lhe moleorethanol in Ihe sample (Mw 46 00 ginoo. 10. AK-for ethanol

Question

9, Calculate lhe moleorethanol in Ihe sample (Mw 46 00 ginoo. 10. AK-for ethanol can be calculated using&Me--(c-_a rln, where n is the moles of ethanol in the sample and Cown is the heat capacity of the calorimetric system Use 10,310 AJk for Cm and calculate the heat of combustion, in kJ/mol, for ethanol. The heat of combustion will be negative since it is an exothermic reaction 11. write an equation for the combustion of ethanol in the form -- nal' (products)- ms, freactants) 12. Calculate the heat of formation for C,H,OH, given the standard enthalpies of formation for CO HO, and O, are -393.5 kJimol,-285.83 kJ/mol, and 0 kJ/mol, respectively. 13·If the accepted value for the enthalpy of ormation for ethanol is 277.7 umol calculate the percent error l your answer-accepted answerl accepted answer x 100 %Error= the conditions are standard state conditions; therefore, This experiment does not consider that all of you are calculating AH, not AH'

Explanation / Answer

9. One mole of ethanol weighs 46g. The given weight is 0.7816 g. Number of moles = 0.7816/46 = 0.017 mol.

10. n= 0.017, from the previous problem.

C = 10.310

dT = 27.44-25 = 2.44 K

dH = CdT/n = 10.310*2.44/0.017 = 1479.78 kJ/mol

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