

Given,
2kcal heat(energy) is supplied to change the internal energy of gas is 5030 J.
2kcal= 2000 cal
Work done= 3350 J
This work done converts in energy of the system.
So, total energy of the system is= 5030J+3350J= 8380 J
So, the mechanical equivalent = 8380/ 2000 = 4.19 J/cal
