PLEASE HELP, its for chem and i'm really stuck on this 1. How many moles are in 20 grams of o2 gas? 2. Find the mass in grams of 8.70 mol of NaOH. 3. What is the molar mass of C₂H₃O₂? 4. Find the number of mole in 6 grams of Gold? 5. How many atoms in 18 grams H₂O?
Please answer all of them, but if you can't at least the majority. EXTRA POINTS for this one :)

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.