Answer: The final energy is 1,700 J
Explanation: According to first law of thermodynamics:
\(\Delta U=q+w\)
\(\Delta U=U_2-U_1\)=Final energy-initial energy=Change in internal energy
q = heat absorbed or released
w = work done by or on the system
w = work done by the system=\(-P\Delta V\) {Work done by the system is negative as the final volume is greater than initial volume}
q = +500J {Heat absorbed by the system is positive}
w = work done by the system = -300J
\(U_2-1500J=+500J-300J\)
\(U_2=1700J\)
