Using an unmanned rocket to visit the space station requires 85.2 trillion BTU of energy. The best fuel for the mission will have the highest ratio of energy to volume. Based on the fuel data in the table select the optimal fuel and calculate the total gallons of fuel required.
Energy Output (BTU/lb) Density
Kerosene: 18500 0.820
Gasoline: 20900 0.737
Ethanol: 11500 0.789
Hydrogen (l) 61100 0.0710