Holooly Plus Logo
Holooly Plus Logo

Question 6.3: Calculate the area necessary to produce the fuels currently ......

Calculate the area necessary to produce the fuels currently necessary for the French fleet of road vehicles (≈50 Mt/year) using sugar beets (3.3 – 3.5 tep/ha), corn (1.5 – 1.7 tep/ha), or rapeseeds (≈3 toe/ha). The total cultivated areas available in France are equal to 18.4 Mha.

Step-by-Step
The 'Blue Check Mark' means that this solution was answered by an expert.
Learn more on how do we answer questions.
Report Answer

The areas necessary are 15.2 – 14.3 Mha for sugar beets, 33.3 – 29.4 Mha for corn, and 16.7 Mha for rapeseed. This means that devoting all the available cultivable areas in France to biofuel production would not be enough. We have the choice of eating or driving, but even if we choose driving, we would be limited to much less driving than is currently possible.

Related Answered Questions

Question: 6.4

One ton of municipal refuse has a calorifi c value between 6 and 12 MJ/ kg. Collecting and disposing of it require about 5000 MJ/ton. Calculate the number of toe corresponding to 1 ton of refuse. In France, a city of 100,000 inhabitants generates about 35,000 tons of refuse per year. Calculate the ...

Verified Answer:

1 toe = 42 GJ. Therefore 1 ton of refuse is equal ...
Question: 6.1

The oversimplified photosynthesis reaction Light + 6H2O+ 6CO2→C6H12O6 + 6O2 requires 4.66 × 10^−18 J per elementary reaction. Calculate the energy per mole in kilowatt-hours and the energy per ton of carbon synthesized. At least 36 photons are needed to drive the photosynthesis reaction above (in ...

Verified Answer:

The energy per mole is 2.8 MJ or 0.78 kWh. This co...
Question: 6.2

We have the following data: 1 toe = 42 GJ = 11.6 MWh. The combustion of 1 toe gives 3.7 tons of CO2 . One ton of dry wood equals 5.22 MWh. Since there is space between the pieces of wood, the volume corresponding to 1 ton is about 2 m³. Assume an oil-fired boiler has an efficiency of 80% and a ...

Verified Answer:

To heat the house 15,000 kWh/year is needed. This ...