In a Reuters News Report Dated February 3, 2010, President

In a Reuters news report dated February 3, 2010, President Obama is quoted as saying, "By 2022 we will more than double the amount of biofuels we produce to 36 billion gallons, which will decrease our dependence on foreign oil by hundreds of millions of barrels per year." Use the following information to determine the fraction of our projected 2022 total energy demand this target represents to assess its significance. (M  mega  10⁶) U.S. projected annual energy demand in 2022: equivalent of 22  10³ Mbarrels of oil
Energy density of oil: 5.9 MJ/barrel
Energy density of biofuels: 100 MJ/gal
Mass density of petroleum: 900 g/L
Mass density of biofuels: 800 g/L
1 gal  3.785 L

A) 2.8%
B) 3.6%
C) 9.2%
D) 4.5%
E) 1.8%

Correct Answer:

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