Question

1. How does hydrogen fuel cell work

Chemical reaction within a hydrogen fuel cell convert hydrogen to gasoline, which can be used to power the car

Chemical reactions within a hydrogen fuel cell produce electricity, which can be used to power an electric motor.****

Hydrogen fuel cells produce water and heat, which can be used to power an electric motor.

Hydrogen fuel cells produce water and heat, which can be converted into gasoline to power the car.


2. How could urine be used as an alternative fuel?

Urine contains hydrogen, which could be used to produce gasoline.

Urine contains water, which could be used to power a fuel cell.

Urine contains ammonia, which could be used to produce gasoline.*****

Urine contains hydrogen, which could be used to power a fuel cell.

Answer 1

1. correct
2. I disagree.
https://www.snopes.com/fact-check/urine-into-electricity/
Perhaps the H2 could be used to power a fuel cell, the last choice.