What is the percent composition of copper alloy if 8.0 g copper is added to enough zinc to produce 100 g of an alloy?

Avariable that is not being directly tested during an experiment should be

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.