Consider a gas sample is contained in a cylinder with a movable piston, shown below.

A process with ΔH = –24.5 kJ and ΔU = –25.0 kJ is done on the gas sample at constant temperature and pressure. Which image corresponds to the state of the gas after the process?

Consider a reaction taking place in a cylindrical container with a movable piston. After the reaction reached completion, the volume changed from 15.0 L to 10.0 L at a constant pressure of 0.843 atm. If the diameter of the piston is 24.0 cm, how far will the piston move? (Useful information: V_cylinder = πr²h, where h is the height; 1 L•atm = 101.325 J)

Consider the following diagram that illustrates different states of a system.

Identify the system that has the largest internal energy.

Identify the sign of ΔU for each indicated system.

a) A gas sample is compressed adiabatically. (System = gas)

b) Hot coffee is cooled in a refrigerator. (System = coffee)

c) A worker pushes a trolley along a ramp (System = worker)

Determine the sign of work when the process below occurs at constant temperature and pressure.