A gas is confined in a steel tank with a volume of 2.25 L. At 289.32 K, the gas exerts a pressure of 6.02 atm. After heating the tank, the pressure of the
gas increases to 8.25 atm. What is the temperature of the heated gas in
degrees C?

yes

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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.