Consider Fe2(SO4)3 + 6 H2O+ 6NH3 → 2Fe(OH)3 + 3(NH4)2SO4 Calculate the mass of water required to make 3.67 g Fe(OH)3

Can someone me with these questions plz.

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?