Question

How many gallons of e85 would be needed to provide the same energy as 40 gal of gasoline?

Answer 1

63 gallons.

Step-by-step explanation:

Hello,

In this case, considering that gasoline and E85 provide 6.6x10^4 kJ and 4.2x10^4 kJ of energy per gallon respectively, one computes the total energy provided by the 40 gallons of gasoline as shown below:

`Energy.gasoline=40gal*(6.6x10^4 kJ)/(1gal)=2.64x10^6kJ`

Now, considering the required energy, and the energy per gallon of E85, one computes how many gallons are needed by dividing the total energy by the energy provided by 1 gallon as follows:

`Gallons=(2.64x10^6kJ)/(4.2x10^4 kJ/gal) \\Gallons=62.9gallons=63gallons`

Such initial result is rounded to 63 gallons in order to equal the provided energy by the gasoline.

Best regards.

Answer 2

56 gal

Step-by-step explanation:

The Gasoline Gallon Equivalents are

1 gal gasoline = 1.3900 gal E85

∴ 40 gal gasoline = 40 × 1.3900/1

40 gal gasoline = 56 gal E85