Nitrogen (gas) and hydrogen (gas) react to form ammonia (NH3) gas in a 1.00 L container. If the system contains 4.30 x 10-2 mol N2, 1.29 x 10-1 mol H2, and 5.50 x 10-3 mol NH3 after reaching equilibrium, what is the equilibrium constant? Does this reaction favor the reactants or products?

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.