9.14 - Key 14 Using Table 8.4(p 326 estimate the enthalpy...

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Key: 14. Using Table 8.4 (p. 326), estimate the enthalpy of the reaction when 11 grams of the alkane called propane (C 3 H 8 ) is completely combusted. (Round liberally) a. 1200 kJ b. -2000 kJ c. -700 kJ d. -500 kJ e. 1.8 x 10 24 atoms f. None of the above We will be using bond enthalpies to solve for the enthalpy of the reaction described. Bond enthalpy is the energy required to break a bond. When a reaction takes place, we model the process as if all of the bonds of the reactants are breaking and all of the bonds of the products are forming. To determine the overall enthalpy of the reaction, we must add up the energy required to break each bond of the reactants and subtract all of the energy released when the bonds in the products are formed. The bond enthalpy of the reactants is positive because it takes energy to break bonds, and so it is endothermic and ΔH is positive. The bond enthalpy of the products on the other hand is negative because energy is released when the bonds form, thus making it exothermic, and making ΔH negative.
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