Answer:

Combustion: You need to use moles in combustion to know how much air is needed, how much exhaust would be produced, as well as how much heat is created

Batteries: Chemicals in batteries react to form electricity. People have to figure out how much of each type of chemical is needed to put together in a battery to make it function properly. They would also need to know the amount of moles of each reactant is needed.

Plastic: Since plastics are made from other chemicals, someone has to figure out how much of each ingredient is needed to use, and that would have involved moles.

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