A sample is prepared by adding 10 grams of oxygen gas to 10 grams of nitrogen gas. No energy change is observed. which best describes sample
A )a mixture that is 50% oxygen by Mass
B) a compound that is 50% oxygen by Mass
C) a mixture in which 50% of the atoms are oxygen
D) a compound in which 50% of the atoms are oxygen

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.