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Why use hydrogen in a fuel cell?

Answer 1

It is efficient, produces a vast amount of energy and the combustion of hydrogen doesn't result in the by products of harmful pollutants or green house gases

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Answer 2

Julia Acosta

Hydrogen is used in fuel cells because it can undergo electrochemical reactions with oxygen to produce electricity, emitting water as the only byproduct. This process is efficient, environmentally friendly, and provides a clean source of energy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.