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)

Shown below is a gas contained in a cylinder with a piston.

Suppose that 150 J of energy is added to the system under these two scenarios:
(a) the piston is allowed to move
(b) the piston is not allowed to move

In which scenario does the gas have higher temperature after the input of energy?

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. 

A system releases 896 kJ of heat and does 254 kJ of work on the surroundings. What is the change in internal energy of the system?