In the calculation above, we used the fuel value of graphite as a model for coal. Graphite is 100% carbon. However, the fuel value of coal varies from 15 kJ/gram to 32 kJ/gram. (2pts) Why is the fuel value of coal different from carbon (graphite)?
Why does the fuel value of coal have a range?

catya your not at all which answer i've seen you do this on another question!

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.  

im doing test rn im going with 2 but ill give answer if itss wrong,   : )