Answer:
296.2J
Step-by-step explanation:
From the first law, you should know that the change in internal energy of a system is given by:
ΔE = q + w
where q is the heat added to the system (q is negative if heat is released from the system)
and w is the work done on the system by the surroundings.
We are told that q = -128 J.
Because the volume of the system decreases, the surroundings are doing work on the system, so w will be positive. If the compression is done "quasistatically", so that the internal pressure of the system is always infinitesimally close to the external pressure, then the work done is w = p*ΔV
1 atm = 1.01*10^5 Pa, and 1 liter = 10^-3 m^3, so:
w = (1.01^10^5 N/m^2)*(5.40 - 1.20)*10^-3 m^3
w = 424.2 J
The change internal energy is then:
ΔE = -128 J + 424.2J = + 296.2 J