Nitrogen gas and oxygen gas react according to the following equation: energy + n2(g) + o2(g) double arrow yields 2no(g) nitrogen gas and oxygen gas are placed in a sealed container and are allowed to reach equilibrium. what effect will cooling the system have?

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.