Calculate the mass of emitted into the atmosphere upon accelerating the from 0.0

Question

Calculate the mass of emitted into the atmosphere upon accelerating the from 0.0 to 67.0 . Assume that the required energy comes from the combustion of octane with efficiency. (Hint: Use to calculate the kinetic energy required for the acceleration.)

Explanation / Answer

C8H18 --> 8 CO2 and you'll look up the enthalpy of combustion deltaH (in kJ/mol, ideally) for this reaction. Then you'll calculate the number of moles of octane N required 1/2 mv^2 = deltaH x N x 30% (the engine isn't perfectly efficient) then calculate the moles of CO2 n n mol CO2 = N mol octane x (8 mol CO2 / 1 mol octane) and finally the mass of CO2 (n mol CO2) x (??? g/mol CO2) To use the equation for kinetic energy, you'll need to convert miles/hour to meters/s: (67 mi/hr) (5280 ft / 1 mi) (12 in / 1 ft) (2.54 cm / 1 in) (1 m / 100 cm) = ??? m/hr x (1 hr / 60 min) (1 min / 60 s) = ??? m/s Mass of SUV = 2700 kg

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