Calculate the change in the internal energy of the system for a process in which the system absorbs 140J of heat from the surroundings and does 85J of work on the surroundings.

The change in the internal energy of a system can be calculated using the First Law of Thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system: ΔU = Q - W Given that the system absorbs 140J of heat from the surroundings (Q = 140J) and does 85J of work on the surroundings (W = 85J), we can substitute these values into the equation: ΔU = 140J - 85J ΔU = 55J Therefore, the change in the internal energy of the system is 55J.