In an experiment, 0.250 moles of propanoic acid, CH3CH2COOH were mixed with 0.150 moles of ethanol and the mixture was allowed to reach equilibrium. Given the total volume is 250 cm3 . CH3CH2COOH (aq) + C2H5OH (aq) ⇌ CH3CH2COOC2H5 (aq) + H2O (l) At equilibrium, 0.125 moles of propanoic acid remained. Calculate the value of Kc for the above reaction.

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.