Calculate the change in the internal energy of the system for a process in which the system absorbs 140J of heat from the surrounding and does 85J of work on the surrounding.
The change in internal energy of the system is given by the equation:
ΔU = Q - W
Where:
ΔU = Change in internal energy
Q = Heat absorbed by the system
W = Work done by the system
Given:
Q = 140J
W = -85J (negative because work is done on the surroundings)
ΔU = 140J - (-85J)
ΔU = 140J + 85J
ΔU = 225J
Therefore, the change in internal energy of the system is 225J.