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Google Chrome or-assignment-take&itakeAssignmentSessionLocator; assignment-take Use the References to access important values if needed for this questos Ethanol, C.H O, is most often blended with gasoline- usually as a 10 percent mix- to create a fuel called gasohol. Ethanol is a renewable resource and ethanol-blended fuels, like gasohol, appear to burn more efficiently in combustion engines. The heat of combustion of ethanol is 326.7 kcal mol. The heat of combustion of heptane, C-H6 is 1.151 10 keal mol. How much energy is released during the complete combustion of 462 grams of heptane? kcal Assuming the same efficiency, would 462 grams of ethanol provide more, less, or the same amount of energy as 462 grams of heptane? Retry Entire Group 8 more group atignpts remaining Subenit Answr

Explanation / Answer

C7H16 + 15O2 ------------> 7CO2 + 8CO2   DH = -1.151*10^3 Kcal/mole
   1 mole of C7H16 on combsution to gives -1.151*10^3 Kcal/mole
   100g of C7H16 on combustion to gives -1.151*10^3 Kcal/mole
   462g of C7H16 on combustion to gives = -1.151*10^3*462/100 = -5317.62KCal/mole

2C3H6 + 9O2 ---------> 6Co2 + 6H2O    DH = -999.6Kcal/mole
2moles of C3H6 on combustion gives -999.6Kcal/mole
2*42g of C3H6 on combustion to gives -999.6kCal/mole
357g of C3H6 on combustion to gives = -999.6*357/2*42   = -4248.3Kcal/mole

   2C3H6 + 9O2 ---------> 6Co2 + 6H2O    DH = -999.6Kcal/mole

   C3H6 + 1/2O2 ---------> 3Co2 + 3H2O    DH = -499.8Kcal/mole
                                          DH = -499.8Kcal/mole/42g/mole
                                              = -11.9Kcal/g

2C3H6 + 9O2 ---------> 6Co2 + 6H2O    DH = -999.6Kcal

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