As long as the heat capacity is Cp=(7/2)R, one mole of gas is adiabatically compressed at 25 degrees in the piston and cylinder device to 7 bar from a state of 2 bar. This process is irreversible and requires 35% more work than the reversible insulation process from the initial state to the same final pressure state. What is the entropy change of this gas?

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.  

answer would be option a) they have mobile charged particles.