How many grams of iron is 3.91 x 10^22 atoms of iron? (Report answer as a number rounded to one place past the decimal.)

(Picture of Periodic Table)

Is this a single replacement reaction or there is no

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas

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.