Two moles of an ideal gas are heated at constant pressure from T = 27°C to T = 107°C. (a) Draw a pV-diagram for this process. (ANSWER IS )

Video transcript

Hey everyone today, we're dealing with the problem about pressure versus volume diagrams. So we're being told that a container is filled with 1.8 molds of an ideal gas. The gas is heated from 18 to 90 degrees Celsius, but the pressure is being kept constant as such. We're being asked to identify which diagram qualitatively represents the pressure versus volume diagram for the specific process. So let's go ahead and make our own little graph. So on a pressure versus volume diagram we usually have pressure on the Y axis and we have volume on the X axis pressure. So this is our origin. But we're being told that pressure is being held constant, pressure is being held constant, right? So when pressure is being held constant, let's say it's at a value here. That means we'll have we'll just label this X. For now that means we'll have a horizontal line, we'll have a horizontal line at that. Why value? Right. Because the pressure is not increasing or decreasing its staying at that value for the entire time. However, we're being told that the gas is being heated. Now, if you recall our rules about ideal gasses because we're dealing with an ideal gas here, when a gas is heated, it expands which means the volume or it presses against the inside of the container and sort of increases the volume inside. So we're moving from a lower volume to a higher volume. We're moving from a lower volume to a higher volume. So we will put an arrow pointing towards the right because the positive X direction represents increasing volume That means V is also increasing. So the only answer choice that matches this, the only diagram that qualitatively represents the PV diagram for this process will be answer choice A. I hope this helps, and I look forward to seeing you all in the next one.