The Isobaric process is where the pressure is kept constant while the temperature is increased/decreased. P= nRT/V. For this, I set n = 1 mole, Pressure is in KPa, T is in kelvins, V is in M^3, and R = 8.31 KPa* m^3/mol* K. As the temperature increases, the gas expands, pushing the weight further and further up.
As stated previously, work done can be calculated by getting the area under the the points. Since the path is a horizontal line, the area is simply a rectangle. I will not address Q here, however.
Click on the flash window. If you hold down the up/down key, the temperature will rapidly change. My interactive includes -273 degrees Celcius. Keep in mind that this is unrealistic, as the volume is shown to be compressed to nothing.