Rusting of ion occurs in the presence of moisture according to the following equation 4Fe (s) +3 O, (9) -- 2 Fe,0, (s)

How many grams of rust, Fe2O3, will be produced if a large amount of Fe is exposed
to 34.5 L of oxygen?

How many grams of Fe will rust?

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.