In walking a kilometer, you use about 100 kJ of energy. This energy comes from the oxidation of foods, which is about 30% efficient. How much energy do you save.by walking 8.45 kilometers instead of driving a car that gets 10.9 km L1 of gasoline (25.6 miles per gallon)? Take the density of gasoline to be 0.680 g mL1 and its enthalpy of combustion to be -48.0 kJ g 1. k)

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