How do you know the state of a compound when writing out the equation. WILL MARK BRAINLIEST PLEASE HELP!!

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

How many moles are in 43.9 l of oxygen

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.