Question

hydrogen fuel cells are a type of alternative energy. these cells are expensive, but they produce no air pollution. what is the major by - product of hydrogen fuel cells? carbon dioxide water

Explanation:

Hydrogen fuel cells work by combining hydrogen and oxygen to produce electricity. The chemical reaction in a hydrogen fuel cell is \( 2H_2 + O_2
ightarrow 2H_2O \). So the major by - product is water. Carbon dioxide is a by - product of processes involving carbon - based fuels (like combustion of fossil fuels), and hydrogen fuel cells do not involve carbon, so they don't produce carbon dioxide.

Answer:

Water